summaryrefslogtreecommitdiff
path: root/Master/texmf-dist/source/latex/datetime2/datetime2.dtx
blob: 7eb33e1e000bb98f9a91cb873a2dea6c9d070ae0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
4735
4736
4737
4738
4739
4740
4741
4742
4743
4744
4745
4746
4747
4748
4749
4750
4751
4752
4753
4754
4755
4756
4757
4758
4759
4760
4761
4762
4763
4764
4765
4766
4767
4768
4769
4770
4771
4772
4773
4774
4775
4776
4777
4778
4779
4780
4781
4782
4783
4784
4785
4786
4787
4788
4789
4790
%\iffalse
% datetime2.dtx generated using makedtx version 1.1 (c) Nicola Talbot
% Command line args:
%   -section "chapter"
%   -src "datetime2.sty\Z=>datetime2.sty"
%   -src "datetime2-calc.sty\Z=>datetime2-calc.sty"
%   -doc "datetime2-manual.tex"
%   -author "Nicola Talbot"
%   datetime2
% Created on 2015/9/15 10:14
%\fi
%\iffalse
%<*package>
%% \CharacterTable
%%  {Upper-case    \A\B\C\D\E\F\G\H\I\J\K\L\M\N\O\P\Q\R\S\T\U\V\W\X\Y\Z
%%   Lower-case    \a\b\c\d\e\f\g\h\i\j\k\l\m\n\o\p\q\r\s\t\u\v\w\x\y\z
%%   Digits        \0\1\2\3\4\5\6\7\8\9
%%   Exclamation   \!     Double quote  \"     Hash (number) \#
%%   Dollar        \$     Percent       \%     Ampersand     \&
%%   Acute accent  \'     Left paren    \(     Right paren   \)
%%   Asterisk      \*     Plus          \+     Comma         \,
%%   Minus         \-     Point         \.     Solidus       \/
%%   Colon         \:     Semicolon     \;     Less than     \<
%%   Equals        \=     Greater than  \>     Question mark \?
%%   Commercial at \@     Left bracket  \[     Backslash     \\
%%   Right bracket \]     Circumflex    \^     Underscore    \_
%%   Grave accent  \`     Left brace    \{     Vertical bar  \|
%%   Right brace   \}     Tilde         \~}
%</package>
%\fi
% \iffalse
% Doc-Source file to use with LaTeX2e
% Copyright (C) 2015 Nicola Talbot, all rights reserved.
% \fi
% \iffalse
%<*driver>
\documentclass[widecs,report]{nlctdoc}

\usepackage{metalogo}
\usepackage{graphicx}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[calc,english,en-GB,useregional=false]{datetime2}
\usepackage[colorlinks,
            bookmarks,
            hyperindex=false,
            pdfauthor={Nicola L.C. Talbot},
            pdftitle={datetime2: date and time formats}]{hyperref}


\CheckSum{1943}

\renewcommand*{\usage}[1]{\hyperpage{#1}}
\renewcommand*{\main}[1]{\hyperpage{#1}}
\IndexPrologue{\chapter*{\indexname}\markboth{\indexname}{\indexname}}
\setcounter{IndexColumns}{2}

\newcommand{\style}[1]{\texttt{#1}\index{#1=\texttt{#1} style|main}}

\doxitem{Option}{option}{options (definitions)}

\DTMsavetimestamp{gmt}{2015-03-01T15:35:09+00:00}
\DTMsavetimestamp{bst}{2015-04-01T08:55:39+01:00}

\begin{document}
\DocInput{datetime2.dtx}
\end{document}
%</driver>
%\fi
%
%\MakeShortVerb{"}
%
%\title{datetime2 v1.1:
%date and time formats}
%\author{Nicola L. C. Talbot\\\url{http://www.dickimaw-books.com/}}
%
%\date{2015-09-15}
%\maketitle
%
%\begin{abstract}
%The \styfmt{datetime2} package replaces the \styfmt{datetime}
%package. Languages and regional variations are dealt with by the
%\styfmt{datetime2} language modules which are independently
%maintained and installed. Make sure that when you install
%\styfmt{datetime2} you also install the required \styfmt{datetime2}
%language modules.
%\end{abstract}
%
%\tableofcontents
%
%\chapter{Introduction}
%\label{sec:intro}
%
%I~wrote the original \styfmt{datetime} package back in the 1990s as
%an alternative to the \sty{ukdate} package, which had dropped out of
%some of the TeX distributions, so it was designed specifically for
%UK date formats.\footnote{Of course, \texttt{ukdatetime} would've
%been a better name, but the 8 dot 3 filename restriction was a concern back
%then.} However some users found the time formats useful
%and the ability to save dates for later use, so when \sty{babel}
%came along I~had a number of requests to make \sty{datetime}
%compatible with \sty{babel} so that the regional date formats were
%preserved but the other \sty{datetime} functions could be used. 
%Then PDF\TeX\ came into existence and its \cs{pdfcreationdate} now
%provided a~way of obtaining the seconds and time zone, which can't
%be obtained from \TeX's \cs{time} primitive.  Over time, the
%continual updates to the package has started to put a~strain on the
%original na\"ive \LaTeX\ code of my first package, as it's been
%stretched well past its intended design.
%
%The other problem with \sty{datetime} is that some of the commands
%aren't expandable but some users want to be able to use them in
%expandable contexts (such as, for example, PDF bookmarks or writing
%a date stamp to an external file) or they
%want to be able to upper case the first letter if the date comes at
%the start of a~sentence. This isn't an issue in English, as the
%weekday and month names are proper nouns and so automatically start
%with an upper case letter, regardless of where they appear in
%a~sentence. Users who don't know the history and original purpose of
%the \sty{datetime} package are puzzled as to why the defaults are
%all UK English or some styles were hard-coded, and some users are
%confused as to the ordering of the day, month and year parameters.
%In addition, some command names were incompatible with other
%date-related packages, but renaming those commands would break
%compatibility with older documents.
%
%In order to address all these issues, a~replacement package is
%necessary. Your old documents that use \sty{datetime} should
%still be able to compile, but for your new documents, you may prefer
%the improved \styfmt{datetime2} package instead.
%
%\chapter{Example Usage}
%\label{sec:examples}
%
%\begin{verbatim}
%\documentclass{article}
%\usepackage{datetime2}
%\begin{document}
%This PDF was created on \today.
%\end{document}
%\end{verbatim}
%In the above example, the date is displayed in the form:
%\begin{display}
%\DTMsetstyle{default}\DTMusedate{gmt}
%\end{display}
%This is the \style{default} style.
%
%\begin{verbatim}
%\documentclass{article}
%\usepackage{datetime2}
%\begin{document}
%This PDF was created on \DTMnow.
%\end{document}
%\end{verbatim}
%In the above example, the full date, time and time zone is displayed
%in the form
%\begin{display}
%\DTMsetstyle{default}\DTMuse{gmt}
%\end{display}
%or
%\begin{display}
%\DTMsetstyle{default}\DTMuse{bst}
%\end{display}
%\emph{unless} you are using \XeLaTeX\ in which case the seconds and
%time zone are omitted. (\XeLaTeX\ doesn't provide this information.)
%Alternatively you can hide the seconds and zone
%using the package options \pkgopt[false]{showseconds} and
%\pkgopt[false]{showzone}. If you want UTC+0 to be displayed
%numerically instead of using a Z you can use the
%\pkgopt[false]{showisoZ} package option.
%
%\begin{verbatim}
%\documentclass[british]{article}
%\usepackage{babel}
%\usepackage{datetime2}
%\begin{document}
%This PDF was created on \DTMnow.
%\end{document}
%\end{verbatim}
%This has the same default numerical output as the previous example,
%but there are now two additional styles available: \style{en-GB} and
%\style{en-GB-numeric}. The \cs{datebritish} command provided by
%\sty{babel} is redefined to prevent \sty{babel} from overriding your
%preferred date style. The regional style can be enabled with the
%\pkgopt{useregional} option.
%
%\begin{verbatim}
%\documentclass[british]{article}
%\usepackage{babel}
%\usepackage[useregional]{datetime2}
%\begin{document}
%This PDF was created on \DTMnow.
%\end{document}
%\end{verbatim}
%The full date, time and zone are displayed in the form
%\begin{display}
%\DTMsetstyle{en-GB}\DTMuse{gmt}
%\end{display}
%or
%\begin{display}
%\DTMsetstyle{en-GB}\DTMuse{bst}
%\end{display}
%
%\begin{verbatim}
%\documentclass[british]{article}
%\usepackage{babel}
%\usepackage[useregional=numeric]{datetime2}
%\begin{document}
%This PDF was created on \DTMnow.
%\end{document}
%\end{verbatim}
%The full date, time and zone are displayed in the form
%\begin{display}
%\DTMsetstyle{en-GB-numeric}\DTMuse{gmt}
%\end{display}
%or
%\begin{display}
%\DTMsetstyle{en-GB-numeric}\DTMuse{bst}
%\end{display}
%
%\begin{verbatim}
%\documentclass[english]{article}
%\usepackage{babel}
%\usepackage[useregional=numeric]{datetime2}
%\begin{document}
%This PDF was created on \DTMnow.
%\end{document}
%\end{verbatim}
%The full date, time and zone are displayed in the form
%\begin{display}
%\DTMsetstyle{default}\DTMuse{gmt}
%\end{display}
%This is because no \emph{regional dialect} has been specified. The
%language name \texttt{english} is
%ambiguous, so the \style{default} style is used.
%
%\begin{verbatim}
%\documentclass[english]{article}
%\usepackage{babel}
%\usepackage[useregional]{datetime2}
%\begin{document}
%This PDF was created on \today.
%\end{document}
%\end{verbatim}
%The date is now displayed as
%\begin{display}
%\DTMsetstyle{english}\DTMusedate{gmt}
%\end{display}
%since that's \LaTeX's default behaviour for \cs{today}. For other
%languages, you should check the language module documentation to
%find out what happens when the region can't be determined from the
%language name.
%
%\begin{verbatim}
%\documentclass[british]{article}
%\usepackage{babel}
%\usepackage[useregional,showdow]{datetime2}
%
%\DTMlangsetup[en-GB]{abbr}
%
%\begin{document}
%This PDF was created on \today.
%\end{document}
%\end{verbatim}
%The date is now displayed as
%\begin{display}
%\DTMsetstyle{en-GB}\DTMlangsetup[en-GB]{abbr}\DTMsetup{showdow}%
%\DTMusedate{gmt}
%\end{display}
%The options used in \cs{DTMlangsetup} (such as \texttt{abbr}) are
%provided by the language modules and should be described in the
%module's documentation. Different languages may have different
%options so \texttt{abbr} may not be available for some of them. The
%\pkgopt{showdow} (show day of week) option is a package-wide option.
%You need to check the documentation to find out which styles check
%the \pkgopt{showdow} setting as not all of them do.
%
%\chapter{Displaying the Date and Time}
%\label{sec:display}
%
%A specific date can be displayed using:
%\begin{definition}[\DescribeMacro\DTMdisplaydate]
%\cs{DTMdisplaydate}\marg{year}\marg{month}\marg{day}\marg{dow}
%\end{definition}
%The format used to display the date is governed by the 
%\termdef{display style}.
%
%The arguments are all \emph{numerical}: \meta{year} is the year,
%\meta{month} is the month number (starting from~1 for January),
%\meta{day} is the day of the month and \meta{dow} is the day of the
%week number starting from~0 for Monday. The day of week number may
%be \texttt{-1}, which indicates that the style should ignore it.
%(Some styles always ignore the day of week, regardless of its
%value.) This command is intended for use in expandable contexts
%(such as writing the date to another file or using the date in the
%bookmarks) and is used by \cs{today}. The date styles should ensure
%that any fragile content is protected. (This is why the \meta{dow}
%isn't an optional argument otherwise the command wouldn't be
%expandable.)
%
%Some styles may start the date with a word (such as the day of the
%week name or the month name). In English, proper nouns are
%capitalised regardless of where they appear in a~sentence but some
%languages use lower case month or day of week names. In this event,
%if the initial letter needs to be capitalised then you can use:
%\begin{definition}[\DescribeMacro\DTMDisplaydate]
%\cs{DTMDisplaydate}\marg{year}\marg{month}\marg{day}\marg{dow}
%\end{definition}
%which is analogous to \cs{DTMdisplaydate}. Styles that are
%unaffected by this issue (for example, numerical or English dates)
%set \cs{DTMDisplaydate} to just \cs{DTMdisplaydate}. As with
%\cs{DTMdisplaydate} the style needs to ensure that any fragile
%content is protected in the event that \cs{DTMDisplaydate} is used
%in an expandable context. (Note that for this reason, I~don't
%recommend the use of the commands provided by the \sty{mfirstuc}
%package as they're not expandable.)
%
%The current date is displayed using
%\begin{definition}[\DescribeMacro\today]
%\cs{today}
%\end{definition}
%This uses \cs{DTMdisplaydate} to format the date so it will match
%the currently selected date style. There's also a first letter
%upper case version that uses \cs{DTMDisplaydate}:
%\begin{definition}[\DescribeMacro\Today]
%\cs{Today}
%\end{definition}
%
%\begin{important}
%If you use \sty{babel} or \sty{polyglossia} you must make sure 
%you have the relevant \styfmt{datetime2} language modules installed.
%(See \sectionref{sec:lang}.) You also need to make sure that
%\styfmt{datetime2} is loaded \emph{after}
%\sty{babel}\slash\sty{polyglossia} otherwise \cs{today} will be
%redefined so that it no longer uses \cs{DTMdisplaydate}.
%\end{important}
%
%As mentioned above, some styles allow the day of the week to be
%displayed. This requires the \sty{datetime2-calc} package which will
%automatically be loaded if you set \pkgopt{showdow} in the
%\styfmt{datetime2} package option list or if you set
%\pkgopt{showdow} in \ics{DTMsetup} \emph{in the preamble}. The
%package option \pkgopt{calc} will also load \sty{datetime2-calc} or
%you can load it explicitly using \cs{usepackage} after
%\styfmt{datetime2} has been loaded. (You may use \pkgopt[true]{showdow} in
%the \env{document} environment if the \styfmt{datetime2-calc}
%package has been loaded in the preamble either explicitly or through
%the \pkgopt{calc} option.)
%
%When \sty{datetime2-calc} is loaded, it computes the current day of
%the week (using commands provided by the \sty{pgfcalendar} package)
%which can then be used by \cs{today} or \cs{Today}. If 
%\sty{datetime2-calc} isn't loaded then neither \cs{today} nor
%\cs{Today} will display the day of the week, regardless of the
%current style.
%
%If you would like a more convenient syntax and don't care about
%expansion, there is also a~robust \emph{non-expandable} command that
%can be used to display a~particular date:
%\begin{definition}[\DescribeMacro\DTMdate]
%\cs{DTMdate}\marg{date}
%\end{definition}
%As before there's also a capitalised version:
%\begin{definition}[\DescribeMacro\DTMDate]
%\cs{DTMDate}\marg{date}
%\end{definition}
%In these cases the date should be provided as
%\meta{YYYY}\texttt{-}\meta{MM}\texttt{-}\meta{DD} in the argument
%\meta{date}. For example:
%\begin{verbatim}
%\DTMdate{2015-03-23}
%\end{verbatim}
%
%Note that hyphens must always be used, regardless of
%the separator options. Take care that the category code of the
%hyphen hasn't changed when you use this syntax.
%
%\begin{important}
%The year \meta{YYYY} can't be negative\footnotemark\ in \cs{DTMdate} or
%\cs{DTMDate}. Use \cs{DTMdisplaydate} or 
%\cs{DTMDisplaydate} instead.
%\end{important}\footnotetext{Well, actually it can if you put it in braces
%and don't use \sty{datetime2-calc}.}
%
%These commands internally use \cs{DTMdisplaydate} and
%\cs{DTMDisplaydate}, respectively. If the \sty{datetime2-calc}
%package has been loaded, the day of the week will be computed,
%otherwise the day of the week will be set to \texttt{-1}. Another
%benefit of the \sty{datetime2-calc} package is that it allows
%additional formats permitted by the \sty{pgfcalendar} package:
%\begin{itemize}
%\item \meta{YYYY}\texttt{-}\meta{MM}\texttt{-last} (the last day of
%the given month).
%
%\item
%\meta{YYYY}\texttt{-}\meta{MM}\texttt{-}\meta{DD}\texttt{+-}\meta{n}
%(\meta{n} days before the given date).
%
%\item
%\meta{YYYY}\texttt{-}\meta{MM}\texttt{-}\meta{DD}\texttt{+}\meta{n}
%(\meta{n} days after the given date).
%
%\item \meta{YYYY}\texttt{-}\meta{MM}\texttt{-last+-}\meta{n}
%(\meta{n} days before the last day of
%the given month).
%
%\item \meta{YYYY}\texttt{-}\meta{MM}\texttt{-last+}\meta{n}
%(\meta{n} days after the last day of
%the given month).
%
%\end{itemize}
%See the \sty{pgfcalendar} package for further details.
%
%If you want to be able to use a date in an expandable context that
%can perform these calculations, consider first saving the date using
%one of the commands described in \sectionref{sec:store} and then use
%one of the expandable commands such as \cs{DTMuse} to display the
%date.
%
%An error or unexpected results may occur if you try using one of
%these extended formats without loading the \sty{datetime2-calc}
%package. An example that only works with \sty{datetime2-calc}:
%\begin{verbatim}
%\DTMdate{2015-03-last}
%\end{verbatim}
%An example that works with or without \sty{datetime2-calc}:
%\begin{verbatim}
%\DTMdate{2015-03-31}
%\end{verbatim}
%In this second case, you'll only notice a difference in the output
%if the style should show the day of the week.
%
%The style of the date is the same as for \cs{DTMdisplaydate} and
%\cs{DTMDisplaydate} (which \cs{DTMdate} and \cs{DTMDate} internally
%use, as mentioned above).
%
%A time can be displayed using
%\begin{definition}[\DescribeMacro\DTMdisplaytime]
%\cs{DTMdisplaytime}\marg{hour}\marg{minute}\marg{sec}
%\end{definition}
%where the arguments are all numerical (using 24 hours). The 
%\termdef{time style} currently in effect determines how the time is formatted.
%The command is designed to be used in an expandable context so the
%styles should take care to protect any fragile commands.
%
%Note that this command doesn't display the time zone. To display the
%time zone, you need to use
%\begin{definition}[\DescribeMacro\DTMdisplayzone]
%\cs{DTMdisplayzone}\marg{TZh}\marg{TZm}
%\end{definition}
%where \meta{TZh} is the hour offset and \meta{TZm} is the minute
%offset. The display is governed by the \termdef{zone style}.
%Again, the style should protect any fragile commands in case this is
%used in an expandable context.
%
%The current time (as set at the start of the document build)
%can be displayed using
%\begin{definition}[\DescribeMacro\DTMcurrenttime]
%\cs{DTMcurrenttime}
%\end{definition}
%This internally just uses \cs{DTMdisplaytime} and so is designed for
%use in an expandable context.
%
%The current zone can be displayed using
%\begin{definition}[\DescribeMacro\DTMcurrentzone]
%\cs{DTMcurrentzone}
%\end{definition}
%This internally just uses \cs{DTMdisplayzone} and so is designed for
%use in an expandable context.
%
%\begin{important}
%If the PDF\TeX\ primitive \ics{pdfcreationdate} is defined, the
%current time information is obtained from that, which includes the
%seconds and time zone. Lua\TeX\ also defines this command but
%\XeTeX\ doesn't, and in that case the only way to determine the
%current time is from \TeX's \ics{time} primitive which only contains
%the number of minutes since midnight, which means that the seconds
%and time zone are unavailable. Therefore if \XeTeX\ is used, the
%\pkgopt{showseconds} and \pkgopt{showzone} options are automatically
%switched off.
%\end{important}
%
%There is also a~non-expandable robust command to display the time:
%\begin{definition}[\DescribeMacro\DTMtime]
%\cs{DTMtime}\marg{tm}
%\end{definition}
%where \meta{tm} must be in the 24 hour format 
%\meta{hh}\texttt{:}\meta{mm}\texttt{:}\meta{ss}
%(colon-separated numerical arguments). Take care if you use \sty{babel}
%with a~language setting that makes the colon character active. You
%will have to switch off the shorthands in order to use this command
%correctly.
%
%The full date, time and zone (if available) can be displayed using
%\begin{definition}[\DescribeMacro\DTMdisplay]
%\cs{DTMdisplay}\marg{year}\marg{month}\marg{day}\marg{day of week}\marg{hh}\marg{mm}\marg{ss}\marg{TZh}\marg{TZm}
%\end{definition}
%The arguments are all numerical.  The way the information is
%displayed in the document is governed by the \termdef{full style}
%(or \termdef{date-time style}).
%Typically the full style will redefine this command to use 
%\cs{DTMdisplaydate}, \cs{DTMdisplaytime} and (optionally)
%\cs{DTMdisplayzone}. The \pkgopt{showzone} setting may govern whether
%or not to display the time zone (although a~style may ignore this
%setting). The separators between the date and time and between the time
%and zone are governed by the style.
%
%There is also an analogous version if capitalisation is required:
%\begin{definition}[\DescribeMacro\DTMDisplay]
%\cs{DTMDisplay}\marg{year}\marg{month}\marg{day}\marg{day of week}\marg{hh}\marg{mm}\marg{ss}\marg{TZh}\marg{TZm}
%\end{definition}
%Some styles may simply make this equivalent to \cs{DTMdisplay}.
%Other styles may use a~similar format to \cs{DTMdisplay} but replace
%\cs{DTMdisplaydate} with \cs{DTMDisplaydate}.
%
%The full current date, time and (optionally) zone can be displayed
%using:
%\begin{definition}[\DescribeMacro\DTMnow]
%\cs{DTMnow}
%\end{definition}
%which uses \cs{DTMdisplay} or
%\begin{definition}[\DescribeMacro\DTMNow]
%\cs{DTMNow}
%\end{definition}
%which uses \cs{DTMDisplay}.
%
%\chapter{Storing and Using Dates and Times}
%\label{sec:store}
%
%Date, time and zone information can be saved for later use. Note
%that the information is always saved numerically. The style is only
%applied when the information is later used. The commands that save
%the information are robust and not expandable. The commands that use the
%data are typically expandable although there may be some exceptions. 
%Take care that the colon (\texttt{:}) and hyphen (\texttt{-})
%characters haven't had their normal category code changed. (For
%example, through \sty{babel}'s shortcuts.) In the commands below,
%the \meta{name} (no active characters) is a name that uniquely
%identifies the information.
%
%Dates are saved using
%\begin{definition}[\DescribeMacro\DTMsavedate]
%\cs{DTMsavedate}\marg{name}\marg{date}
%\end{definition}
%where \meta{date} is in the same format as for \cs{DTMdate}.
%As with \cs{DTMdate} (and \cs{DTMDate}) the format can be extended
%with the \sty{datetime2-calc} package. If you want to access the day
%of week, you must make sure that \sty{datetime2-calc} has been
%loaded \emph{before you save the date}. (Remember that the \pkgopt{calc}
%and \pkgopt{showdow} package options will automatically load
%\sty{datetime2-calc}.) If \sty{datetime2-calc} has been loaded, the
%day of week number will be calculated and saved. Whether or not it
%is displayed in the document when the date is later used depends on
%the settings when the date is displayed not when it's saved.
%
%This command will override any previously defined date saved with
%this \meta{name}. If a time or zone hasn't been defined with this
%\meta{name}, the time and zone elements will all be set to 0
%otherwise they will remain unchanged.
%
%Note that you can't have a negative year in \meta{date}. There's an
%alternative command you can use instead that doesn't try parsing
%\meta{date}:
%\begin{definition}[\DescribeMacro\DTMsavenoparsedate]
%\cs{DTMsavenoparsedate}\marg{name}\marg{YYYY}\marg{MM}\marg{DD}\marg{dow}
%\end{definition}
%The day of week \meta{dow} may be \texttt{-1} if unknown. This
%command doesn't calculate the day of week, even if
%\sty{datetime2-calc} has been loaded.
%
%Times are saved using
%\begin{definition}[\DescribeMacro\DTMsavetime]
%\cs{DTMsavetime}\marg{name}\marg{time}
%\end{definition}
%where the \meta{time} is in the same format as for \cs{DTMtime}.
%
%This command will override any previously defined time saved with
%this \meta{name}. If a date or
%zone hasn't been defined with this \meta{name}, the date and zone
%elements will all be set to 0 (or \texttt{-1} for the day of week) otherwise they will remain unchanged.
%
%Times and zone are saved using
%\begin{definition}[\DescribeMacro\DTMsavetimezn]
%\cs{DTMsavetimezn}\marg{name}\marg{time and zone}
%\end{definition}
%where the \meta{time and zone} is in the form
%\begin{display}
%\meta{hh}:\meta{mm}:\meta{ss} \meta{TZh}:\meta{TZm}
%\end{display}
%(Note the space between the seconds and the hour offset.)
%
%This command will override any previously defined time and zone
%saved with this \meta{name}. If a date hasn't been defined with this
%\meta{name}, the year, month and day will be set to zero and the day
%of the week to \texttt{-1} otherwise they will remain unchanged.
%
%All date, time and zone information can be saved at the same time
%using:
%\begin{definition}[\DescribeMacro\DTMsavetimestamp]
%\cs{DTMsavetimestamp}\marg{name}\marg{data}
%\end{definition}
%where \meta{data} is in the format:
%\begin{display}
%\meta{YYYY}-\meta{MM}-\meta{DD}T\meta{hh}:\meta{mm}:\meta{ss}\meta{zone}
%\end{display}
%The \meta{zone} may either be \texttt{Z} or in the form
%\meta{TZh}\texttt{:}\meta{TZm} (for example, \texttt{-03:00}
%or \texttt{-3:0}). This will override any date, time or zone data
%previously saved with this \meta{name}.
%
%The current date and time can be saved using:
%\begin{definition}[\DescribeMacro\DTMsavenow]
%\cs{DTMsavenow}\marg{name}
%\end{definition}
%
%There is also a command that can be used to save the modification
%date of a file, but it's not available for some \TeX\ engines:
%\begin{definition}[\DescribeMacro\DTMsavefilemoddate]
%\cs{DTMsavefilemoddate}\marg{name}\marg{file name}
%\end{definition}
%where \meta{file name} is the name of the file (remember to use
%forward slashes \verb|/| for the directory divider). If you build
%your document using PDF\LaTeX, this command will use the PDF\TeX\
%primitive \cs{pdffilemoddate}. If you use Lua\TeX\ this command will
%attempt to use \texttt{os.date} but it uses \texttt{\%z} for the
%time zone, which may not work on some operating systems. If you use
%\XeLaTeX\ this command will generate a warning and will assume a
%date of 0000-00-00T00:00:00Z.
%
%The above commands are all localised to the current scope. If the
%data is required after the end of the scope, you can make the
%assignments global using:
%\begin{definition}[\DescribeMacro\DTMmakeglobal]
%\cs{DTMmakeglobal}\marg{name}
%\end{definition}
%For example:
%\begin{verbatim}
%\DTMsavenow{mydate}\DTMmakeglobal{mydate}
%\end{verbatim}
%
%A previously saved date can be displayed using the current style
%with
%\begin{definition}[\DescribeMacro\DTMusedate]
%\cs{DTMusedate}\marg{name}
%\end{definition}
%This just uses \cs{DTMdisplaydate}. An error will occur if
%\meta{name} hasn't been defined. Alternatively for the capitalised
%version:
%\begin{definition}[\DescribeMacro\DTMUsedate]
%\cs{DTMUsedate}\marg{name}
%\end{definition}
%which uses \cs{DTMDisplaydate} instead.
%
%A previously saved time can be displayed using the current style
%with
%\begin{definition}[\DescribeMacro\DTMusetime]
%\cs{DTMusetime}\marg{name}
%\end{definition}
%This just uses \cs{DTMdisplaytime}. An error will occur if
%\meta{name} hasn't been defined.
%
%A previously saved zone can be displayed using the current style
%with
%\begin{definition}[\DescribeMacro\DTMusezone]
%\cs{DTMusezone}\marg{name}
%\end{definition}
%This just uses \cs{DTMdisplayzone}. An error will occur if
%\meta{name} hasn't been defined.
%
%The entire date, time and zone can be displayed in the current style
%with
%\begin{definition}[\DescribeMacro\DTMuse]
%\cs{DTMuse}\marg{name}
%\end{definition}
%This uses \cs{DTMdisplay}. An error will occur if
%\meta{name} hasn't been defined. Alternatively,
%\begin{definition}[\DescribeMacro\DTMUse]
%\cs{DTMUse}\marg{name}
%\end{definition}
%will use \cs{DTMDisplay} instead.
%
%You can determine if a given \meta{name} has been defined
%using
%\begin{definition}[\DescribeMacro\DTMifsaveddate]
%\cs{DTMifsaveddate}\marg{name}\marg{true}\marg{false}
%\end{definition}
%
%The individual numerical elements can be fetched using one of the
%following commands. These don't check if the given data identified
%by \meta{name} has been defined and will expand to \cs{relax} if the
%name isn't recognised.
%
%\begin{definition}[\DescribeMacro\DTMfetchyear]
%\cs{DTMfetchyear}\marg{name}
%\end{definition}
%This expands to the year.
%
%\begin{definition}[\DescribeMacro\DTMfetchmonth]
%\cs{DTMfetchmonth}\marg{name}
%\end{definition}
%This expands to the month number.
%
%\begin{definition}[\DescribeMacro\DTMfetchday]
%\cs{DTMfetchday}\marg{name}
%\end{definition}
%This expands to the day of the month.
%
%\begin{definition}[\DescribeMacro\DTMfetchdow]
%\cs{DTMfetchdow}\marg{name}
%\end{definition}
%This expands to the day of the week number (\texttt{-1} if unknown).
%
%\begin{definition}[\DescribeMacro\DTMfetchhour]
%\cs{DTMfetchhour}\marg{name}
%\end{definition}
%This expands to the hour.
%
%\begin{definition}[\DescribeMacro\DTMfetchminute]
%\cs{DTMfetchminute}\marg{name}
%\end{definition}
%This expands to the minute.
%
%\begin{definition}[\DescribeMacro\DTMfetchsecond]
%\cs{DTMfetchsecond}\marg{name}
%\end{definition}
%This expands to the second.
%
%\begin{definition}[\DescribeMacro\DTMfetchTZhour]
%\cs{DTMfetchTZhour}\marg{name}
%\end{definition}
%This expands to the hour offset.
%
%\begin{definition}[\DescribeMacro\DTMfetchTZminute]
%\cs{DTMfetchTZminute}\marg{name}
%\end{definition}
%This expands to the minute offset.
%
%\chapter{Styles}
%\label{sec:styles}
%
%If you want to just change the \term{date style} use:
%\begin{definition}[\DescribeMacro\DTMsetdatestyle]
%\cs{DTMsetdatestyle}\marg{name}
%\end{definition}
%where \meta{name} identifies the style. For example:
%\begin{verbatim}
%\DTMsetdatestyle{iso}
%\end{verbatim}
%This will just change the date style (\cs{DTMdisplaydate} and
%\cs{DTMDisplaydate}), not the time or zone styles. Note that
%\cs{DTMdisplay} typically uses \cs{DTMdisplaydate} so this will also
%change the date element of \cs{DTMdisplay}.
%
%If you want to just change the \term{time style} use:
%\begin{definition}[\DescribeMacro\DTMsettimestyle]
%\cs{DTMsettimestyle}\marg{name}
%\end{definition}
%where \meta{name} identifies the style. For example:
%\begin{verbatim}
%\DTMsettimestyle{iso}
%\end{verbatim}
%This will just change the time style (\cs{DTMdisplaytime}), not the
%date or zone styles. Note that \cs{DTMdisplay} typically uses
%\cs{DTMdisplaytime} so this will also change the time element of
%\cs{DTMdisplay}.
%
%If you want to just change the \term{zone style} use:
%\begin{definition}[\DescribeMacro\DTMsetzonestyle]
%\cs{DTMsetzonestyle}\marg{name}
%\end{definition}
%where \meta{name} identifies the style. For example:
%\begin{verbatim}
%\DTMsetzonestyle{iso}
%\end{verbatim}
%This will just change the zone style (\cs{DTMdisplayzone}), not the
%date or time styles. Note that \cs{DTMdisplay} typically uses
%\cs{DTMdisplayzone} so this will also change the zone element of
%\cs{DTMdisplay}.
%
%If you want to change the \term{full style} use:
%\begin{definition}[\DescribeMacro\DTMsetstyle]
%\cs{DTMsetstyle}\marg{name}
%\end{definition}
%where \meta{name} identifies the style. For example:
%\begin{verbatim}
%\DTMsetstyle{iso}
%\end{verbatim}
%
%Note that in this case this does more than simply
%\begin{verbatim}
%\DTMsetdatestyle{iso}\DTMsettimestyle{iso}\DTMsetzonestyle{iso}
%\end{verbatim}
%as it also changes \cs{DTMdisplay} and \cs{DTMDisplay}.
%If the style \meta{name} is only a \term{partial style}, a~warning
%will be issued for any partial styles that aren't defined for the
%given name as well as a warning for the undefined full style.
%An error will occur if there are neither partial nor full styles
%with the given \meta{name}.
%
%The predefined styles listed in \sectionref{sec:predefinedfull} are all
%\emph{full styles}. This means that they change the date, time, zone
%and full format, so any of them can be used in \cs{DTMsetdatestyle},
%\cs{DTMsettimestyle}, \cs{DTMsetzonestyle} or \cs{DTMsetstyle}.
%However it's possible for a style to be only a \emph{partial style},
%such as those described in \sectionref{sec:predefinedtime}.
%
%For example, if \texttt{foo} is a \term{date style} and
%a \term{time style} but isn't a \term{zone style} or 
%a \term{full style} then you can use
%\begin{verbatim}
%\DTMsetdatestyle{foo}
%\end{verbatim}
%and
%\begin{verbatim}
%\DTMsettimestyle{foo}
%\end{verbatim}
%but you can't use \cs{DTMsetzonestyle}. You can use
%\begin{verbatim}
%\DTMsetstyle{foo}
%\end{verbatim}
%but this will now only be equivalent to
%\begin{verbatim}
%\DTMsetdatestyle{foo}\DTMsettimestyle{foo}
%\end{verbatim}
%and while \cs{DTMdisplay} and \cs{DTMDisplay} will typically use these date
%and time settings, the way that the date, time and zone are arranged
%will be governed by the full style setting that was already in
%effect before the date and time style changed.
%
%The style changes are all local and so are affected by the current
%scope.
%
%\section{Predefined Styles}
%\label{sec:predefinedstyles}
%
%The base \styfmt{datetime2} package provides a number of predefined
%numerical styles. \sectionref{sec:predefinedfull} lists the full styles,
%which can be used with \cs{DTMsetstyle}, \cs{DTMsetdatestyle},
%\cs{DTMsettimestyle} and \cs{DTMsetzonestyle}.
%\sectionref{sec:predefinedtime} lists the predefined (partial) times
%styles, which can be used with \cs{DTMsettimestyle} and
%\cs{DTMsetstyle}.
%
%\subsection{Full Styles}
%\label{sec:predefinedfull}
%
%The following are predefined full styles that are provided by the
%base \styfmt{datetime2} package.  Additional styles are available
%through the language modules (see \sectionref{sec:lang}).
%
%\begin{description}
%\item[\style{default}] The \style{default} style displays the date in the form
%\begin{display}
%\meta{YYYY}\meta{YMsep}\meta{MM}\meta{MDsep}\meta{DD}
%\end{display}
%where the month \meta{MM} and day of the month \meta{DD} numbers are
%formatted as two digits. The separators \meta{YMsep} and
%\meta{MDsep} default to a hyphen but can be changed using the
%options \pkgopt{yearmonthsep}, \pkgopt{monthdaysep} or
%\pkgopt{datesep} (either through the package options or using
%\ics{DTMsetup}).
%
%The time is displayed in the form:
%\begin{display}
%\meta{hh}\meta{HMsep}\meta{mm}\meta{MSsep}\meta{ss}
%\end{display}
%where the hour, month and seconds are formatted as two digits. The
%final \meta{MSsep}\meta{ss} is omitted if the option
%\pkgopt{showseconds} has been set to \texttt{false}. The separators
%\meta{HMsep} and \meta{MSsep} default to a~colon (\texttt{:}) but
%these may be changed using the options \pkgopt{hourminsep},
%\pkgopt{minsecsep} or \pkgopt{datetimesep}.
%
%The zone is displayed in form
%\begin{display}
%\meta{TZh}\meta{HMsep}\meta{TZm}
%\end{display}
%or just \texttt{Z} if the option \pkgopt{showisoZ} is set to
%\texttt{true} and both \meta{TZh} and \meta{TZm} are zero.
%The separator \meta{HMsep} is the same as used for the time format.
%The final \meta{HMsep}\meta{TZm} is omitted if the option
%\pkgopt{showzoneminutes} is set to \texttt{false}. The hour offset
%\meta{TZh} is formatted as two digits proceeded by either \texttt{+}
%or \texttt{-} and the minute offset is formatted as two digits.
%Note that since one of the main purposes of this package is to
%provide expandable date commands that can be used to write
%information to external files, no attempt is made to convert the
%hyphen \texttt{-} (for negative offsets) into a minus sign. If you
%want it rendered correctly in your document, consider placing the
%time zone command in math mode and adjust the separators as
%necessary.
%
%The full style is in the form
%\begin{display}
%\meta{date}\meta{DTsep}\meta{time}\meta{TZsep}\meta{zone}
%\end{display}
%The \meta{date}\meta{DTsep} part is omitted if the option
%\pkgopt{showdate} is set to \texttt{false}, and
%the \meta{TZsep}\meta{zone} part is omitted if the option
%\pkgopt{showzone} is set to \texttt{false}. The separator between
%the date and time \meta{DTsep} defaults to \cs{space} but may be
%changed using the \pkgopt{datetimesep} option. The separator between
%the time and zone \meta{TZsep} defaults to nothing but may be
%changed using the \pkgopt{timezonesep} option.
%
%\item[\style{iso}] The \style{iso} style is like the \style{default}
%style but the separators can't be changed. The separators used in
%the date format are fixed as hyphens and the separators used in the
%time and zone formats are fixed as colons. In the full format, the separator between the
%date and time is fixed as \texttt{T} and there's no separator between the
%time and zone. The only options that can change the \style{iso}
%style are \pkgopt{showseconds}, \pkgopt{showdate}, \pkgopt{showzone},
%\pkgopt{showzoneminutes} and \pkgopt{showisoZ}.
%
%\item[\style{yyyymd}] This is like the \style{default} style
%except that the month and date aren't forced into a two-digit
%format.
%
%\item[\style{ddmmyyyy}] This is like the \style{default} style
%except that the date is formatted in the reverse order
%\begin{display}
%\meta{DD}\meta{MDsep}\meta{MM}\meta{YMsep}\meta{YYYY}
%\end{display}
%The day and month are displayed as two-digits and the separators are
%as for the \style{default} style. The options that modify the
%\style{default} style similarly modify this style.
%
%\item[\style{dmyyyy}] This is like the \style{ddmmyyyy} style except
%that it doesn't force the day and month into a~two-digit format.
%The options that modify the
%\style{default} style similarly modify this style.
%
%\item[\style{dmyy}] This is like the \style{dmyy} style except
%that it only displays the final two digits of the year.
%The options that modify the
%\style{default} style similarly modify this style.
%
%\item[\style{mmddyyyy}] This is like the \style{ddmmyyyy} style
%except the day and month numbers are reversed. The separator between
%the month and day is still given by the \pkgopt{monthdaysep} or 
%\pkgopt{datesep} options. The separator between the day and year is given by
%the \pkgopt{dayyearsep} or \pkgopt{datesep} options.
%
%\item[\style{mdyyyy}] This is like the \style{mmddyyyy} style except
%that it doesn't force the day and month into a~two-digit format.
%
%\item[\style{mdyy}] This is like the \style{mdyyyy} style except
%that the year only has the final two digits displayed.
%
%\item[\style{pdf}] This formats the date, time and zone so that the
%full style is in the form required by the date settings in
%\ics{pdfinfo}. The date format is
%\begin{display}
%D:\meta{YYYY}\meta{MM}\meta{DD}
%\end{display}
%where the month and day numbers are displayed as two digits.
%
%The time format is
%\begin{display}
%\meta{hh}\meta{mm}\meta{ss}
%\end{display}
%where the numbers are displayed as two digits.
%
%The zone format is
%\begin{display}
%\meta{hh}'\meta{mm}'
%\end{display}
%or Z for zero time offset if the option \pkgopt{showisoZ} is
%used. (The \pkgopt{showisoZ} option is the only option that modifies
%the \style{pdf} style.) The hour and minutes are displayed as two
%digits where the hour has the sign present (either \texttt{+} or
%\texttt{-}).
%
%The full style is a concatenation of the date, time and zone.
%\begin{display}
%D:\meta{YYYY}\meta{MM}\meta{DD}\meta{hh}\meta{mm}\meta{ss}\meta{hh}'\meta{mm}'
%\end{display}
%
%\end{description}
%
%\subsection{Time Styles}
%\label{sec:predefinedtime}
%
%There's only one predefined time (partial) style provided
%by the base \styfmt{datetime2} package. This style can be used to
%override the time format part of full styles. For example, to use
%the \style{default} full style with the \sty{hmmss} time style:
%\begin{verbatim}
%\DTMsetstyle{default}\DTMsettimestyle{hmmss}
%\end{verbatim}
%
%\begin{description}
%\item[\style{hmmss}] The \style{hmmss} style is like the time style
%provided by the full \style{default} style except that the hour
%isn't forced into two digits.
%
%\end{description}
%
%\subsection{Zone Styles}
%\label{sec:predefinedzone}
%
%The following are predefined zone (partial) styles that are provided
%by the base \styfmt{datetime2} package. These styles can be used to
%override the zone format part of full styles. For example, to use
%the \style{default} full style with the \style{map} zone style:
%\begin{verbatim}
%\DTMsetstyle{default}\DTMsetzonestyle{map}
%\end{verbatim}
%
%\begin{description}
%\item[\style{map}] The \style{map} style uses
%\cs{DTMusezonemapordefault} to display the mapping, if one exists,
%or use the default style, if a mapping doesn't exist. For example:
%\begin{verbatim}
%\DTMNatoZoneMaps
%\DTMsetzonestyle{map}
%\end{verbatim}
%This first defines the NATO mappings and then switches to the
%\style{map} style.
%
%\item[\style{hhmm}] The \style{hhmm} style displays the time zone in
%the form
%\begin{display}
%\meta{TZh}\meta{HMsep}\meta{TZm}
%\end{display}
%where \meta{HMsep} is given by the \pkgopt{hourminsep} option.
%This style honours the \pkgopt{showzoneminutes} option
%but ignores the \pkgopt{showisoZ} option. The hour is always
%prefixed by the sign.
%
%\end{description}
%
%\section{Defining New Styles}
%\label{sec:newstyle}
%
%A new \term{date style} can be defined using:
%\begin{definition}[\DescribeMacro\DTMnewdatestyle]
%\cs{DTMnewdatestyle}\marg{name}\marg{definition}
%\end{definition}
%This defines a \term{partial style} that should only modify 
%\cs{DTMdisplaydate} and \cs{DTMDisplaydate}. The redefinition of
%these commands should be placed in \meta{definition}.
%
%A new \term{time style} can be defined using:
%\begin{definition}[\DescribeMacro\DTMnewtimestyle]
%\cs{DTMnewtimestyle}\marg{name}\marg{definition}
%\end{definition}
%This defines a \term{partial style} that should only modify 
%\cs{DTMdisplaytime}. The redefinition should be placed in 
%\meta{definition}.
%
%A new \term{zone style} can be defined using:
%\begin{definition}[\DescribeMacro\DTMnewzonestyle]
%\cs{DTMnewzonestyle}\marg{name}\marg{definition}
%\end{definition}
%This defines a \term{partial style} that should only modify 
%\cs{DTMdisplayzone}. The redefinition should be placed in 
%\meta{definition}.
%
%A new \term{full style} can be defined using:
%\begin{definition}[\DescribeMacro\DTMnewstyle]
%\cs{DTMnewstyle}\marg{name}\marg{date style definition}\marg{time
%style definition}\marg{zone style definition}\marg{full style definition}
%\end{definition}
%This does
%\begin{display}
%\cs{DTMnewdatestyle}\marg{name}\marg{date style definition}\newline
%\cs{DTMnewtimestyle}\marg{name}\marg{time style definition}\newline
%\cs{DTMnewzonestyle}\marg{name}\marg{zone style definition}\newline
%\end{display}
%and finally \meta{full style definition} should redefine
%\cs{DTMdisplay} and \cs{DTMDisplay}.
%
%\begin{important}
%Remember to use a double-hash to reference the parameters (\verb|##1|,
%\verb|##2| etc) within \meta{definition} in all the above.
%In each case \meta{name} is the label identifying the style
%and shouldn't contain active characters.
%\end{important}
%
%There are some helper commands provided that you might want to use
%in the style definitions.
%
%\begin{definition}[\DescribeMacro\DTMtwodigits]
%\cs{DTMtwodigits}\marg{number}
%\end{definition}
%This displays \meta{number} so that it has \emph{only} two digits.
%Unlike \LaTeX's \cs{two@digits} this will check for a negative
%number and will trim a number whose absolute value is greater
%than 100. This command is expandable.
%
%\begin{definition}[\DescribeMacro\DTMcentury]
%\cs{DTMcentury}\marg{year}
%\end{definition}
%This converts \meta{year} to the century. If \meta{year} is negative it does:
%\begin{display}
%\texttt{-\cs{DTMcentury}\{-\meta{year}\}}
%\end{display}
%Example:
%\begin{verbatim}
%\DTMcentury{1945}
%\end{verbatim}
%expands to \DTMcentury{1945} (not 19). Note that
%\begin{verbatim}
%\DTMcentury{1900}
%\end{verbatim}
%expands to \DTMcentury{1900}.
%
%\begin{definition}[\DescribeMacro\DTMdivhundred]
%\cs{DTMdivhundred}\marg{number}
%\end{definition}
%This expands to $\lfloor\meta{number}/100\rfloor$ (integer division
%by 100 rounded down). For example:
%\begin{verbatim}
%\DTMdivhundred{1945}
%\end{verbatim}
%expands to \DTMdivhundred{1945} and
%\begin{verbatim}
%\DTMdivhundred{1900}
%\end{verbatim}
%expands to \DTMdivhundred{1900}.
%
%\begin{definition}[\DescribeMacro\DTMtexorpdfstring]
%\cs{DTMtexorpdfstring}\marg{\TeX}\marg{PDF}
%\end{definition}
%If \sty{hyperref} is loaded, this is equivalent to
%\cs{texorpdfstring} otherwise it just does the first argument and
%ignores the second. (The check for \sty{hyperref} is deferred until
%the start of the \env{document} environment, so it doesn't matter if
%\sty{hyperref} is loaded after \styfmt{datetime2}.) This command may
%be used to provide alternative text to use if the date\slash
%time\slash zone is displayed in the PDF bookmarks.
%
%\begin{definition}[\DescribeMacro\DTMsep]
%\cs{DTMsep}\marg{tag}
%\end{definition}
%This accesses the value of the \meta{tag}\texttt{sep} base package
%option. (Not the language module options.)
%For example
%\begin{verbatim}
%\DTMsep{yearmonth}
%\end{verbatim}
%expands to the value supplied by the \pkgopt{yearmonthsep} package option.
%
%\begin{definition}[\DescribeMacro\DTMusezonemap]
%\cs{DTMusezonemap}\marg{TZh}\marg{TZm}
%\end{definition}
%This expands to the time zone abbreviation or \cs{relax} if no
%mapping has been set for the given time zone.
%
%You can define a time zone mapping using
%\begin{definition}[\DescribeMacro\DTMdefzonemap]
%\cs{DTMdefzonemap}\marg{TZh}\marg{TZm}\marg{abbr}
%\end{definition}
%For example
%\begin{verbatim}
%\DTMdefzonemap{00}{00}{GMT}
%\DTMdefzonemap{01}{00}{BST}
%\end{verbatim}
%Note that \styfmt{datetime2} doesn't know anything about daylight
%saving, so this is only really designed for dates and times 
%in a~specific location. This overwrites any previous mapping
%for this time zone.
%
%The base \styfmt{datetime2} package provides
%\begin{definition}[\DescribeMacro\DTMNatoZoneMaps]
%\cs{DTMNatoZoneMaps}
%\end{definition}
%This defines the military\slash NATO mappings from A (Alpha time) to
%Z (Zulu time). You can use this command if you want these time zones
%(but remember to set an appropriate time zone style that uses
%the zone mappings).
%
%The language modules may provide mappings that are enabled
%when you switch to that style. For example, the \texttt{en-GB}
%language module provides the \pkgopt{mapzone} option which, if set
%to \texttt{true}, will map +00:00 to GMT and +01:00 to BST. See the
%documentation for the language module for further details.
%
%\begin{definition}[\DescribeMacro\DTMclearmap]
%\cs{DTMclearmap}\marg{TZh}\marg{TZm}
%\end{definition}
%Clears the time zone mapping. The regional time zone styles should
%use
%\begin{definition}[\DescribeMacro\DTMresetzones]
%\cs{DTMresetzones}
%\end{definition}
%before applying any regional mappings. This defaults to nothing
%which means that any mappings previously defined by other styles
%won't be cleared. You can redefine this command if you want to clear
%any mappings that aren't relevant for other regions.
%
%You can test if a~mapping is defined using
%\begin{definition}[\DescribeMacro\DTMhaszonemap]
%\cs{DTMhaszonemap}\marg{TZh}\marg{TZm}\marg{true}\marg{false}
%\end{definition}
%This will do \meta{true} if there is a mapping defined for that time
%zone or \meta{false} otherwise.
%
%\begin{definition}[\DescribeMacro\DTMusezonemapordefault]
%\cs{DTMusezonemapordefault}\marg{TZh}\marg{TZm}
%\end{definition}
%This will use the mapping if its defined otherwise it 
%will expand to the format
%\meta{TZh}\meta{HMsep}\meta{TZm}
%where \meta{HMsep}\meta{TZm} is omitted if the option
%\pkgopt{showzoneminutes} is set to \texttt{false}. The separator
%\meta{HMsep} is as given by the \pkgopt{hourminsep} option. (The
%\pkgopt{showisoZ} option isn't used here so UTC+00:00 will be
%displayed as +00:00 or +00 if there's no mapping.)
%
%Here's an example of a simple date style that just displays the year
%and month as two digits but uses the \pkgopt{yearmonthsep} option:
%\begin{verbatim}
%\newdatestyle
% {mmyy}% label
% {% definitions
%   \renewcommand*{\DTMdisplaydate}[4]{%
%     \DTMtwodigits{##2}\DTMsep{yearmonth}\DTMtwodigits{##1}}%
%   \renewcommand*{\DTMDisplaydate}{\DTMdisplaydate}%
% }
%\end{verbatim}
%
%If you want to distribute your new styles, just put the definitions
%in a package and upload it to CTAN. For example (replace
%\texttt{mystylename} with something more appropriate, and also
%change the date in the \cs{ProvidesPackage} line):
%\begin{verbatim}
% \NeedsTeXFormat{LaTeX2e}
% \ProvidesPackage{mystylename}[2014/03/24 v1.0]
% \RequirePackage{datetime2}
%
% % style definitions here
%
% \endinput
%\end{verbatim}
%Save the file as \texttt{mystylename.sty}, add some documentation
%about the style (or styles) provided and read the instructions at
%\url{http://www.ctan.org/upload} and
%\url{http://www.ctan.org/file/help/ctan/CTAN-upload-addendum}. The upload location
%for additions to the \styfmt{datetime2} package (either for
%packages defining new styles or for language modules) should be
%\texttt{/macros\slash latex\slash contrib\slash datetime2-contrib\slash mystylename} (remember to
%replace \texttt{mystylename} as appropriate).
%
%\chapter{Multi-Lingual Support}
%\label{sec:lang}
%
%If you want to use \styfmt{datetime2} with \sty{babel} or
%\sty{polyglossia}, make sure you load
%\sty{babel}\slash\sty{polyglossia} \emph{before} you load
%\styfmt{datetime2} otherwise their \cs{date}\meta{language} will
%overwrite \cs{datetime}'s definition of \cs{today}.
%\emph{Additionally} you need to make sure you install the relevant
%\styfmt{datetime2} language modules. These modules are automatically
%loaded, if required, by \styfmt{datetime2} but only if they are
%already installed. Remember that if you use \XeLaTeX\ you won't have
%the seconds or time zone available for the current date and time.
%
%\begin{important}
%If the required language modules aren't installed or
%\styfmt{datetime2} is loaded before
%\sty{babel}\slash\sty{polyglossia} then \styfmt{datetime2}'s
%definition of \cs{today} will be overridden and may no longer match
%the currently selected date style.
%\end{important}
%
%Each language module defines a textual style (where the month is
%displayed as a word) for that language or region
%which can be used in the argument of \cs{DTMsetstyle},
%\cs{DTMsetdatestyle}, \cs{DTMsettimestyle} or \cs{DTMsetzonestyle}.
%The language module may also define a numeric style. In the
%ambiguous cases where the language name alone doesn't indicate the
%region (for example, \texttt{english} instead of \texttt{UKenglish} or
%\texttt{USenglish}) the module should use the \style{default} numeric
%style (see \sectionref{sec:predefinedfull}).
%
%The textual style provided by the module will automatically be
%set using \cs{DTMsetstyle} \emph{if the \pkgopt{useregional}
%option is set to \texttt{text}}. By default \pkgopt{useregional} is
%\texttt{false}, unless the language\slash region is passed via the
%\styfmt{datetime2} package option list. (The \pkgopt{useregional}
%option is unaffected if the setting is passed through the document
%class option list.) The numeric style provided by the module will
%automatically be set if the \pkgopt{useregional} option is set to
%\texttt{numeric}. See the descriptions for the \pkgopt{useregional}
%and \pkgopt{style} options in \sectionref{sec:pkgopt}.
%
%\begin{important}
%Be careful not to mix the language\slash region options between the document
%class option list and the \sty{babel}\slash\sty{polyglossia}
%interface. For example:
%\begin{verbatim}
%\documentclass[en-GB]{article}
%\usepackage[canadien,british]{babel}
%\end{verbatim} 
%This will prevent the \sty{tracklang} package from picking up the
%\sty{babel} setting and it will only detect the \texttt{en-GB}
%option. Use only the document class options or only the \sty{babel}
%package option list or duplicate \emph{all} the \sty{babel} package options with
%analogous \sty{tracklang} options in the document class. For example
%\begin{verbatim}
%\documentclass[canadien,british]{article}
%\usepackage{babel}
%\end{verbatim} 
%or
%\begin{verbatim}
%\documentclass{article}
%\usepackage[canadien,british]{babel}
%\end{verbatim} 
%or
%\begin{verbatim}
%\documentclass[fr-CA,en-GB]{article}
%\usepackage[canadien,british]{babel}
%\end{verbatim} 
%\end{important}
%Language modules may be used without \sty{babel} or \sty{polyglossia}.
%For example:
%\begin{verbatim}
%\documentclass{article}
%\usepackage[en-GB]{datetime2}
%\begin{document}
%\today
%\end{document}
%\end{verbatim} 
%If you have more than one language or region you will need to switch
%styles using \cs{DTMsetstyle} etc:
%\begin{verbatim}
%\documentclass{article}
%\usepackage[en-GB,en-CA]{datetime2}
%\begin{document}
%\DTMsetstyle{en-GB}\today.
%\DTMsetstyle{en-CA}\today
%\end{document}
%\end{verbatim} 
%
%If you want to change the number separators for the \emph{regional}
%numeric styles, you need to use \cs{DTMlangsetup}. If you want to
%change the number separators for the base \styfmt{datetime2}
%predefined numeric styles (see \sectionref{sec:predefinedstyles})
%then you need to use \cs{DTMsetup} or the package options. You
%therefore need to use \cs{DTMsetup} for the ambiguous regionless
%language numeric settings since they just use the \style{default}
%style. Check the module documentation to find out if the
%\style{default} style is used.
%
%Examples of use:
%\begin{enumerate}
%\item Language option specified through the document class and
%picked up by \sty{tracklang} (which is loaded by \styfmt{datetime2}).
%This setting is also picked up by \sty{babel} which is loaded before
%\styfmt{datetime2}.
%\begin{verbatim}
%\documentclass[british]{article}
%
%\usepackage{babel}
%\usepackage{datetime2}
%
%\begin{document}
%\today
%\end{document}
%\end{verbatim}
%The date is displayed in the default format 2015-03-01.
%
%In this case, the \texttt{en-GB} language module is loaded which
%defines the text style \style{en-GB} and the numeric style
%\style{en-GB-numeric}. Since \pkgopt{useregional} hasn't been set,
%\cs{today} uses \styfmt{datetime2}'s \style{default} numerical format.
%If \sty{babel} was loaded after \styfmt{datetime2}, the
%\sty{babel}'s hook management system would overwrite
%\styfmt{datetime2}'s definition of \cs{today} so that it no longer used
%\ics{DTMdisplaydate}. A similar result is obtained if in the above
%example \sty{babel} is replaced with \sty{polyglossia} (where the
%language is set in the document class option).
%
%You can change the \pkgopt{useregional} setting either through
%\styfmt{datetime2}'s package options or using \ics{DTMsetup} however
%it will only have an effect during the module loading (when the
%value is changed via the package option) and when
%\cs{date}\meta{language} is used.
%
%For example, in the document below, the date is displayed using the
%\style{default} numeric format because \pkgopt{useregional} has been
%changed \emph{after} \sty{babel} uses \cs{datebritish} to set the
%language at the start of the document.
%\begin{verbatim}
%\documentclass[british]{article}
%
%\usepackage{babel}
%\usepackage{datetime2}
%
%\begin{document}
%\DTMsetup{useregional}
%\today
%\end{document}
%\end{verbatim}
%So here \cs{today} again displays the date in the form 2015-03-01. 
%
%If the setting is moved to the preamble:
%\begin{verbatim}
%\documentclass[british]{article}
%
%\usepackage{babel}
%\usepackage{datetime2}
%
%\DTMsetup{useregional}
%\begin{document}
%\today
%\end{document}
%\end{verbatim}
%then the \pkgopt{useregional} setting is checked at the beginning of
%the document when \sty{babel} uses \cs{datebritish}. So in this case
%\cs{today} will display the date in the form 1st March 2015.
%
%\item Language setting specified through \sty{babel}'s package
%option list:
%\begin{verbatim}
%\documentclass{article}
%
%\usepackage[british]{babel}
%\usepackage{datetime2}
%
%\begin{document}
%\today
%\end{document}
%\end{verbatim}
%This has the same result as placing \texttt{british} in the document
%class option list, so the date is again displayed in the default
%format 2015-03-01 but, as in the previous example, the \style{en-GB}
%and \style{en-GB-numeric} styles are both defined if required.
%
%However a problem occurs if \sty{babel} is replaced by 
%\sty{polyglossia}:
%\begin{verbatim}
%\documentclass{article}
%
%\usepackage{fontspec}
%\usepackage{polyglossia}
%\setdefaultlanguage[variant=uk]{english}
%
%\usepackage{datetime2}
%
%\begin{document}
%\today
%\end{document}
%\end{verbatim}
%In this case \sty{tracklang} is unable to pick up the variant and
%can only detect the root language, so it will load the generic
%\texttt{english} module instead of the \texttt{en-GB} module. This
%means that the \style{en-GB} and \style{en-GB-numeric} styles are no longer
%available. However, since \pkgopt{useregional} is \texttt{false} the
%date is still displayed using the \texttt{default} numeric style
%in the form 2015-03-01.
%
%\item As mentioned above neither \sty{babel} nor \sty{polyglossia} are required in
%order to use the \styfmt{datetime2} language modules. You can simply
%supply the language setting in the package option list:
%\begin{verbatim}
%\documentclass{article}
%
%\usepackage[british]{datetime2}
%
%\begin{document}
%\today
%\end{document}
%\end{verbatim}
%This additionally sets \pkgopt[true]{useregional} (since the
%language is in the package option list not the document class option
%list) so the date produced by \cs{today} now uses the \texttt{en-GB}
%date style in the form 1st March 2015.
%
%\item The regional numeric format can be used instead if
%\pkgopt{useregional} is set to \texttt{numeric}:
%\begin{verbatim}
%\documentclass{article}
%
%\usepackage[british,useregional=numeric]{datetime2}
%
%\begin{document}
%\today
%\end{document}
%\end{verbatim}
%This now displays the date in the form 1/3/2015.
%\end{enumerate}
%
%Many of the language options have synonyms. In addition to the
%\sty{babel} synonyms (such as \pkgopt{british} or
%\pkgopt{UKenglish}) the \sty{tracklang} package provides options in
%ISO form, such as \pkgopt{en-GB}. Note that the style name provided
%by each language module is independent of the package option used
%to select that style. So regardless of whether you use
%\pkgopt{british}, \pkgopt{UKenglish} or \pkgopt{en-GB}, the text style
%name is \style{en-GB} and the numeric style name is
%\style{en-GB-numeric}. If just \pkgopt{english} is used, the text
%style name is \style{english} but the numeric style is
%\style{default}.
%
%Languages where the region is automatically implied, such
%as \pkgopt{scottish}, provide a text style with the root language
%name (\style{scottish} in this instance) and a numeric style in the
%form \meta{language}\texttt{-numeric} (such as \style{scottish-numeric}).
%Note that \texttt{irish} has regionless styles \texttt{irish} and
%\texttt{irish-numeric} but also has regional styles
%\texttt{ga-IE} and \texttt{ga-IE-numeric} (for the Republic of
%Ireland) and \texttt{ga-GB} and \texttt{ga-GB-numeric} (for Northern
%Ireland). In this case the regionless style has a numeric style
%instead of using the \style{default} style since both
%\texttt{ga-IE-numeric} and \texttt{ga-GB-numeric} are the same so
%there's no ambiguity.  The only difference in the three modules
%\texttt{datetime2-irish}, \texttt{datetime2-ga-IE} and
%\texttt{datetime2-ga-GB} is the time zone mappings.
%
%The language modules may provide additional settings that can be
%applied using
%\begin{definition}[\DescribeMacro\DTMlangsetup]
%\cs{DTMlangsetup}\oarg{language list}\marg{options}
%\end{definition}
%where \meta{language list} is a comma-separated list of language
%modules that have been loaded (such as \texttt{en-GB,en-US})
%and \meta{options} is a \meta{key}=\meta{value} list of options.
%If \meta{language list} is omitted, then the list of all loaded
%language modules is assumed. The modules may also provided 
%user commands to further customise the style. These settings should
%all be described in the module's documentation, which should be
%accessible via \texttt{texdoc datetime2-\meta{language}} where
%\meta{language} is the root language name in lower case 
%(such as \texttt{english}).
%
%Note that although I~maintain the \styfmt{datetime2} English
%language module, I~don't maintain the other modules. If you have an
%issue with one of the other modules, please contact the module
%maintainer. If there is no maintainer, feel free to volunteer to
%take over the maintenance (\href{http://www.dickimaw-books.com/contact.html}{send me a
%message}). If there's no module for your language
%you can create your own module and upload it to CTAN in the 
%\texttt{/macros\slash latex\slash contrib\slash datetime2-contrib\slash
%datetime2-\meta{language}} directory.
%
%You can use the English or Irish modules as a template for a
%language with multiple regions. Just download the English source
%files \texttt{datetime2-english.dtx} and
%\texttt{datetime2-english.ins} or the Irish source files
%\texttt{datetime2-irish.dtx} and \texttt{datetime2-irish.ins} from
%CTAN and make the appropriate modifications. Alternatively you can
%use the Scottish module as a template for a single-region language.
%Just download the Scottish source files \texttt{datetime2-scottish.dtx} and
%\texttt{datetime2-scottish.ins} from CTAN and make the appropriate
%modifications. (Don't forget to provide a README file.)
%
%Each language module should be in a file named
%\texttt{datetime2-\meta{lang}.ldf} where \meta{lang} is the language
%name or \meta{language ISO code}\texttt{-}\meta{country ISO code}. (See the
%\sty{tracklang} documentation for further details of the naming
%scheme.)
%
%\begin{important}
%If you want to provide a language module don't assume all users want
%to use the same input encoding or \sty{babel} shortcuts as you. Use \LaTeX\
%commands for non-ASCII characters (and remember to use \cs{protect}
%where necessary).
%\end{important}
%
%As an addendum to the above warning, Lua\TeX\ and \XeTeX\ support
%UTF-8 characters without the need to make them active, so
%I~recommend you provide two files: one with the \LaTeX\ commands,
%such as \cs{c}, for (PDF)\LaTeX\ users, and one with UTF-8 characters
%for Lua\LaTeX\ and \XeLaTeX\ users. For example, the \texttt{fr-FR} module
%could start with:
%\begin{verbatim}
%\ProvidesDateTimeModule{fr-FR}
%
%\RequirePackage{ifxetex,ifluatex}
%
%\ifxetex
% \RequireDateTimeModule{french-utf8}
%\else
% \ifluatex
%   \RequireDateTimeModule{french-utf8}
% \else
%   \RequireDateTimeModule{french-ascii}
% \fi
%\fi
%\end{verbatim}
%
%This helps provide fully expandable dates for Lua\LaTeX\ and
%\XeLaTeX\ users. (See the Scottish or Irish modules.)
%
%\chapter{Package Options}
%\label{sec:pkgopt}
%
%The following package options are provided. Most of these are
%\meta{key}=\meta{value} options, unless stated otherwise.
%
%Settings that govern the predefined numerical styles (not including
%the fixed styles \style{iso} and \style{pdf}):
%\begin{description}
%\item[\pkgopt{yearmonthsep}] This sets the separator between the
%year and month for the big-endian and little-endian styles.
%Default: \texttt{-} (hyphen).
%
%\item[\pkgopt{monthdaysep}] This sets the separator between the
%month and day.
%Default: \texttt{-} (hyphen).
%
%\item[\pkgopt{dayyearsep}] This sets the separator between the
%day and year for the middle-endian styles.
%Default: \texttt{-} (hyphen).
%
%\item[\pkgopt{datesep}] This sets the separators between the day and
%month, the month and year, and the day and year.  Example:
%\begin{verbatim}
%\usepackage[datesep=/]{datetime2}
%\end{verbatim}
%This is equivalent to:
%\begin{verbatim}
%\usepackage[yearmonthsep=/,monthdaysep=/,dayyearsep=/]{datetime2}
%\end{verbatim}
%
%\item[\pkgopt{hourminsep}] This sets the separator between the hour
%and minute. (Both for the time and for the zone.)
%Default: \texttt{:} (colon).
%
%\item[\pkgopt{minsecsep}] This sets the separator between the minute
%and seconds.
%Default: \texttt{:} (colon).
%
%\item[\pkgopt{timesep}] This sets the separators between the hour
%and minute and between the minute and seconds. 
%Example:
%\begin{verbatim}
%\usepackage[timesep=:]{datetime2}
%\end{verbatim}
%This is equivalent to:
%\begin{verbatim}
%\usepackage[hourminsep=:,minsecsep=:]{datetime2}
%\end{verbatim}
%\end{description}
%
%The following settings are used by the predefined numerical styles when 
%displaying the full date, time and zone (excluding the fixed styles \style{iso}
%and \style{pdf}) with commands that use \cs{DTMdisplay} or
%\cs{DTMDisplay}.
%\begin{description}
%\item[\pkgopt{datetimesep}] Sets the separator between the date and
%time.
%Default: \cs{space}.
%
%\item[\pkgopt{timezonesep}] Sets the separator between the time and
%zone.
%Default: empty.
%
%\end{description}
%
%The following settings are used by the predefined styles and may
%also be used by the language modules.
%\begin{description}
%\item[\pkgopt{showseconds}] Boolean key to determine whether or not
%to show the seconds when the time is displayed. The \style{iso}
%style honours this setting but the \style{pdf} style ignores it.
%Default: \texttt{true} unless \XeTeX\ is used.
%
%\item[\pkgopt{showdate}] Boolean key to determine whether or not to
%show the date with commands that use \cs{DTMdisplay} or
%\cs{DTMDisplay}. (Some styles may ignore this.) The \style{iso}
%style honours this setting but the \style{pdf} style ignores it.
%Default: \texttt{true} unless \XeTeX\ is used.
%
%\item[\pkgopt{showzone}] Boolean key to determine whether or not to
%show the time zone with commands that use
%\cs{DTMdisplay} or \cs{DTMDisplay}. (Some styles may ignore this.) The \style{iso} style honours this setting but the
%\style{pdf} style ignores it.
%Default: \texttt{true} unless \XeTeX\ is used.
%
%\item[\pkgopt{showzoneminutes}] Boolean key to determine whether or
%not to show the zone offset minutes. The \style{iso} style honours
%this setting but the \style{pdf} style ignores it. This setting is
%ignored if \pkgopt{showzone} is \texttt{false}.
%Default: \texttt{true}.
%
%\item[\pkgopt{showisoZ}] Boolean key to determine whether or not to
%show UTC+00:00 as \texttt{Z} instead of numerically. This option
%may be ignored by zone styles that use the zone mappings. If you
%want all the time zones in military form, you can use
%\cs{DTMNatoZoneMaps} to set up the time zone abbreviations and then
%use a zone style that uses the mappings.
%Default: \texttt{true}.
%
%\end{description}
%
%General settings:
%\begin{description}
%\item[\pkgopt{useregional}] Allowed values: \texttt{false},
%\texttt{text} or \texttt{numeric}. You may also use \texttt{num} as
%an abbreviation for \texttt{numeric}. If no value is supplied
%\texttt{text} is assumed.
%
%This key determines whether or not to \emph{use} the loaded regional 
%settings and, if the regional setting should be used, it determines
%whether the text style (months as words) or numeric style should be
%used. If you haven't loaded \sty{babel} or \sty{polyglossia}, this
%key only has an effect when used as a package option. If you have
%loaded one of those packages, the change comes into effect at module
%load time and whenever \cs{date}\meta{language} is used (which
%includes at the beginning of the \env{document} environment). If you want
%to switch the style at any other time, you need to use
%\cs{DTMsetstyle} but unless \pkgopt[false]{useregional} the next
%instance of \cs{date}\meta{language} will change the style.
%
%Note that setting this option to \texttt{false} doesn't prevent the modules 
%from being loaded. It just prevents them from automatically setting the style
%and prevents \cs{date}\meta{language} from changing the style if you
%are using \sty{babel} or \sty{polyglossia}.
%
%The default value is \texttt{false} unless the language or region is
%passed to the \styfmt{datetime2} package option list. However, using \pkgopt{style}
%will set \pkgopt{useregional} to \texttt{false}.
%
%Examples:
%\begin{verbatim}
%\documentclass[british]{article}
%\usepackage{babel}
%\usepackage{datetime2}
%\end{verbatim}
%In the above \pkgopt{useregional} is \texttt{false}.
%
%\begin{verbatim}
%\documentclass{article}
%\usepackage[british]{datetime2}
%\end{verbatim}
%In the above \pkgopt{useregional} is \texttt{text}.
%
%\begin{verbatim}
%\documentclass{article}
%\usepackage[british,style=iso]{datetime2}
%\end{verbatim}
%In the above \pkgopt{useregional} is \texttt{false}. (The
%\pkgopt{british} option implements \pkgopt[text]{usenumerical}
%but the \pkgopt{style} option then implements
%\pkgopt[false]{usenumerical}.)
%
%\begin{verbatim}
%\documentclass{article}
%\usepackage[style=iso,british]{datetime2}
%\end{verbatim}
%In the above \pkgopt{useregional} is \texttt{text}. (The
%\pkgopt{style} option implements \pkgopt[false]{usenumerical}
%but the \pkgopt{british} option then implements
%\pkgopt[text]{usenumerical}.)
%
%\item[\pkgopt{style}] Sets the current style using \cs{DTMsetstyle}
%when the \styfmt{datetime2} package has finished loading. This also sets
%\pkgopt[false]{useregional} but that setting can be overridden later
%in the option list.
%
%Default value: empty (use the default style or the regional style,
%according to the value of \pkgopt{useregional}).
%
%This key isn't available in \cs{DTMsetup}. Use \cs{DTMsetstyle} instead.
%
%\item[\pkgopt{calc}] Load the \sty{datetime2-calc} package. This
%will allow the day of week to be computed and allow you to use the
%\sty{pgfcalendar} offset style date formats in commands like
%\cs{DTMdate} as well as defining the commands described in
%\sectionref{sec:calc}. This option doesn't take a value. It can't be switched
%off. This option can't be used in \cs{DTMsetkeys}. The default is to
%not load \sty{datetime2-calc}.
%
%\item[\pkgopt{showdow}] This is a boolean key that determines
%whether or not to show the day of week in styles that support this.
%Note that \pkgopt[true]{showdow} will automatically load
%\sty{datetime2-calc} so
%\begin{verbatim}
%\usepackage[showdow]{datetime2}
%\end{verbatim}
%is equivalent to 
%\begin{verbatim}
%\usepackage[showdow,calc]{datetime2}
%\end{verbatim}
%
%This option may be used in \cs{DTMsetup}, but if you attempt to
%switch it on in the \env{document} environment you'll get an error
%if the \sty{datetime2-calc} package hasn't been loaded.
%Default: \texttt{false}.
%
%\item[\pkgopt{warn}] This is a boolean key. If true (default)
%\styfmt{datetime2} warnings will be displayed. If false, the warnings
%will be suppressed.
%Default: \texttt{true}.
%
%\end{description}
%
%Any additional option passed to the \styfmt{datetime2} package (not
%through \cs{DTMsetup}) will be considered a \sty{tracklang} option
%and will be passed to \cs{TrackPredefinedDialect}. (See the
%\sty{tracklang} documentation for further details of that command.)
%
%Apart from \pkgopt{calc}, \pkgopt{style} and the regional options, all the above
%options can also be set using:
%\begin{definition}[\DescribeMacro\DTMsetup]
%\cs{DTMsetup}\marg{option list}
%\end{definition}
%
%The language modules may additionally provide options which can be
%set using:
%\begin{definition}[\DescribeMacro\DTMlangsetup]
%\cs{DTMlangsetup}\oarg{module list}\marg{option list}
%\end{definition}
%
%This will set the \meta{option list} for each module listed in
%\meta{module list}. Unknown options will generate a~warning rather
%than an error message. The default value of \meta{module list} is
%the list of all loaded modules.
%
%Example:
%\begin{verbatim}
%\documentclass{article}
%\usepackage[british]{datetime2}
%\DTMlangsetup{mapzone}
%\end{verbatim}
%The module list here is \texttt{english-base},\texttt{en-GB} and
%since the \texttt{english-base} doesn't have a \texttt{mapzone}
%option, this will result in a warning:
%\begin{verbatim}
%Package datetime2 Warning: Region `english-base' has ignored 
%(datetime2)                the following settings:
%(datetime2)                mapzone
%\end{verbatim}
%You can either ignore the warning or use the optional argument to
%exclude the \texttt{english-base} module:
%\begin{verbatim}
%\documentclass{article}
%\usepackage[british]{datetime2}
%\DTMlangsetup[en-GB]{mapzone}
%\end{verbatim}
%
%Note that some modules may have options with the same name as the
%above listed package options, but the keys are defined in different
%families (see \sty{xkeyval} documentation) so you need to take care
%to use \cs{DTMsetup} for package-wide settings and \cs{DTMlangsetup}
%for the module-specific settings.
%
%For example, the \pkgopt{datesep} package option described above is
%used by the predefined numerical styles but regional modules that
%provide their own numerical styles may use a different date
%separator that matches their region so they may also provide a
%\texttt{datesep} option independent of the base \pkgopt{datesep}
%option.
%
%Examples:
%\begin{verbatim}
%\documentclass[british]{article}
%\usepackage[datesep=.]{datetime2}
%\begin{document}
%\today
%\end{document}
%\end{verbatim}
%The above displays the date in the form
%{\DTMsetup{datesep=.}\DTMsetdatestyle{default}\today}
%since the default style is in use and \pkgopt{datesep} is used as a
%package option.
%
%\begin{verbatim}
%\documentclass[british]{article}
%\usepackage{datetime2}
%\DTMsetup{datesep=.}
%\begin{document}
%\today
%\end{document}
%\end{verbatim}
%The above displays the date in the form
%{\DTMsetup{datesep=.}\DTMsetdatestyle{default}\today}
%since the default style is in use and \pkgopt{datesep} is used in
%\cs{DTMsetup}.
%
%\begin{verbatim}
%\documentclass[british]{article}
%\usepackage{datetime2}
%\DTMlangsetup{datesep=.}
%\begin{document}
%\today
%\end{document}
%\end{verbatim}
%The above displays the date in the form
%{\DTMlangsetup[en-GB]{datesep=.}\DTMsetdatestyle{default}\today}
%since the default style is in use but \pkgopt{datesep} is used in
%\cs{DTMlangsetup}, which only influences the \style{en-GB-numeric}
%style, which isn't the current style.
%
%\begin{verbatim}
%\documentclass[british]{article}
%\usepackage[useregional=numeric]{datetime2}
%\DTMlangsetup{datesep=.}
%\begin{document}
%\today
%\end{document}
%\end{verbatim}
%The above displays the date in the form
%{\DTMlangsetup[en-GB]{datesep=.}\DTMsetdatestyle{en-GB-numeric}\today}
%since the \style{en-GB-numeric} style is in use and \pkgopt{datesep}
%is used in \cs{DTMlangsetup}.
%
%\begin{verbatim}
%\documentclass[british]{article}
%\usepackage[useregional]{datetime2}
%\DTMlangsetup{datesep=.}
%\begin{document}
%\today
%\end{document}
%\end{verbatim}
%The above displays the date in the form
%{\DTMlangsetup[en-GB]{datesep=.}\DTMsetdatestyle{en-GB}\today}
%since the \style{en-GB} style is in use and \pkgopt{datesep} is used
%in \cs{DTMlangsetup}, which only influences the
%\style{en-GB-numeric} style.
%
%\begin{verbatim}
%\documentclass[british]{article}
%\usepackage[useregional=numeric]{datetime2}
%\DTMsetup{datesep=.}
%\begin{document}
%\today
%\end{document}
%\end{verbatim}
%The above displays the date in the form
%{\DTMsetup{datesep=.}\DTMsetdatestyle{en-GB-numeric}\today}
%since the \style{en-GB-numeric} style is in use but \pkgopt{datesep}
%is used in \cs{DTMsetup} which influences the base predefined
%numeric styles not the regional styles.
%
%\chapter{The \styfmt{datetime2-calc} Package}
%\label{sec:calc}
%
%The \sty{datetime2-calc} package can be loaded after \styfmt{datetime2} in the 
%usual way:
%\begin{verbatim}
%\usepackage{datetime2}
%\usepackage{datetime2-calc}
%\end{verbatim}
%or using the \pkgopt{calc} package option to \styfmt{datetime2}:
%\begin{verbatim}
%\usepackage[calc]{datetime2}
%\end{verbatim}
%or by using \pkgopt[true]{showdow}:
%\begin{verbatim}
%\usepackage[showdow]{datetime2}
%\end{verbatim}
%
%This package loads the \sty{pgfcalendar} package which provides a
%way of computing the day of week from a given date. Once
%\sty{datetime2-calc} has been loaded, you can enable or disable the
%weekday in dates where the style supports this, but note that not
%all styles support this, even if the \sty{datetime2-calc} package
%has been loaded.
%
%As with the commands in \sectionref{sec:store}, the commands
%described below that save date\slash time information will
%\emph{overwrite} any previously defined date\slash time data with
%the same identifying \meta{name}. However, they may only overwrite
%specific elements of the data (for example, just the year, month,
%day and day of week elements) and leave the other elements
%unchanged. Where the remaining elements are undefined they'll be set to
%zero, except for the day of week element, which will be set to
%\texttt{-1}.
%
%In addition to enabling the weekday calculations, the \sty{datetime2-calc} 
%package also provides the following commands:
%\begin{definition}[\DescribeMacro\DTMsavejulianday]
%\cs{DTMsavejulianday}\marg{name}\marg{number}
%\end{definition}
%This uses \cs{pgfcalendarjuliantodate} to obtain the year, month and
%day from the given Julian day number and uses
%\cs{pgfcalendarjuliantoweekday} to obtain the day of week and then
%saves it. The date can later be used with commands such as
%\cs{DTMuse}\marg{name} described in \sectionref{sec:store}.
%Example:
%\begin{verbatim}
%\DTMsavejulianday{mydate}{2457023}
%\end{verbatim}
%
%\begin{definition}[\DescribeMacro\DTMsaveddatetojuliandate]
%\cs{DTMsaveddatetojulianday}\marg{name}\marg{register}
%\end{definition}
%This uses \cs{pgfcalendardatetojulian} to convert a previously saved
%date (identified by \meta{name}) to a Julian day. The result is
%stored in \meta{register} which should be a count register (not a
%\LaTeX\ counter name).
%Example:
%\begin{verbatim}
%\newcount\myct
%\DTMsaveddatetojulianday{mydate}{\myct}
%\end{verbatim}
%
%\begin{definition}[\DescribeMacro\DTMsaveddateoffsettojuliandate]
%\cs{DTMsaveddateoffsettojulianday}\marg{name}\marg{offset}\marg{register}
%\end{definition}
%This is like the previous command but converts the date obtained by
%incrementing the saved date with \meta{offset}. The result is stored
%in \meta{register}. This is equivalent to
%\begin{display}\ttfamily
%\cs{pgfcalendardatetojulian}\{\meta{y}-\meta{m}-\meta{d}+\meta{offset}\}\marg{register}
%\end{display}
%where \meta{y}, \meta{m} and \meta{d} are the year, month and day
%fetched from the saved date. A negative \meta{offset} indicates an earlier
%date.
%Example:
%\begin{verbatim}
%\DTMsaveddateoffsettojulianday{mydate}{2}{\myct}
%\end{verbatim}
%or
%\begin{verbatim}
%\DTMsaveddateoffsettojulianday{mydate}{-7}{\myct}
%\end{verbatim}
%
%\begin{definition}[\DescribeMacro\DTMifdate]
%\cs{DTMifdate}\marg{name}\marg{test}\marg{true}\marg{false}
%\end{definition}
%This is just a convenient interface to \cs{pgfcalendarifdate}
%for a saved date (identified by \meta{name}). The remaining
%arguments are the same as the final three arguments of 
%\cs{pgfcalendarifdate}. Note that the
%\texttt{equals}, \texttt{at least}, \texttt{at most} and
%\texttt{between} keywords available in \meta{test} need to be in the
%format specified by the \sty{pgf} manual, but remember that you can
%use commands like \cs{DTMfetchyear}.
%Example:
%\begin{verbatim}
%Is \texttt{mydate2} (\DTMusedate{mydate2}) before
%\texttt{mydate} (\DTMusedate{mydate})?
%\DTMifdate
% {mydate2}
% {at most=
%   \DTMfetchyear{mydate}-\DTMfetchmonth{mydate}-\DTMfetchday{mydate}}
% {yes}{no}.
%\end{verbatim}
%
%\begin{definition}[\DescribeMacro\DTMsaveddatediff]
%\cs{DTMsavedatediff}\marg{name1}\marg{name2}\marg{register}
%\end{definition}
%Computes the difference (in days) between two saved dates and stores
%the result in the given count register. The first date is identified
%by \meta{name1} and the second date is identified by \meta{name2}.
%The dates are converted to their respective Julian day numbers
%\meta{J1} and \meta{J2} and the result is given by
%\meta{J1}$-$\meta{J2}.
%
%\begin{important}
%Note that the time and zone are not taken into account, even if they
%were provided when the dates were stored.
%\end{important}
%Example:
%\begin{verbatim}
%\DTMsaveddatediff{mydate}{mydate2}{\myct}
%
%\DTMusedate{mydate} is
%\ifnum\myct=0
% the same day as
%\else
%  \ifnum\myct<0
%   \number-\myct\space day\ifnum\myct<-1s\fi\space before
%  \else
%   \number\myct\space day\ifnum\myct>1s\fi\space after
%  \fi
%\fi
%\DTMusedate{mydate2}.
%\end{verbatim}
%
%The \sty{pgfcalendar} package also provides a variety of useful
%date-related commands. See the documentation (part of the \sty{pgf}
%manual) for further details. Note that the language modules don't
%use \sty{pgfcalendar} month and weekday names as the
%\sty{pgfcalendar} package isn't loaded by default.
%
%The \sty{datetime2-calc} package also provides commands that convert
%a datetime instance into Zulu\footnote{That's Zulu as in the NATO
%alphabet representation of the letter Z.}\ time (UTC+00:00).
%
%\begin{definition}[\DescribeMacro\DTMsaveaszulutime]
%\cs{DTMsaveaszulutime}\marg{name}\marg{YYYY}\marg{MM}\marg{DD}\marg{hh}\marg{mm}\newline\marg{ss}\marg{TZh}\marg{TZm}
%\end{definition}
%This converts the given datetime instance into UTC+00:00 and saves
%the result. You can then use the date with commands like \cs{DTMuse}
%described in \sectionref{sec:store}. The \meta{name} argument is the
%label identifying the saved data. The other arguments are all
%numbers.
%Example:
%\begin{verbatim}
%\DTMsaveaszulutime{mydate}{2014}{6}{3}{20}{45}{0}{6}{0}
%\end{verbatim}
%
%\begin{definition}[\DescribeMacro\DTMtozulu]
%\cs{DTMtozulu}\marg{name1}\marg{name2}
%\end{definition}
%Uses \cs{DTMsaveaszulutime} to convert the datetime stored in
%\meta{name1} and saves it to \meta{name2}.
%Example:
%\begin{verbatim}
%\DTMsavetimestamp{mydate}{2014-05-01T03:55:00 -06:00}
%Original date: \DTMuse{mydate}.
%
%\DTMtozulu{mydate}{mydate2}
%UTC+00:00: \DTMuse{mydate2}.
%\end{verbatim}
%The above produces (using the \style{default} format):
%\DTMsetstyle{default}%
%
%\DTMsavetimestamp{mydate}{2014-05-01T03:55:00 -06:00}
%Original date: \DTMuse{mydate}.
%
%\DTMtozulu{mydate}{mydate2}
%UTC+00:00: \DTMuse{mydate2}.
%
%\StopEventually{\PrintIndex}
%
%
%\chapter{The Code}
%\iffalse
%    \begin{macrocode}
%<*datetime2.sty>
%    \end{macrocode}
%\fi
%\section{datetime2.sty code}
%\changes{1.0}{2015-03-24}{Initial release}
%    \begin{macrocode}
\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{datetime2}[2015/09/15 v1.1 (NLCT) date and time formats]
%    \end{macrocode}
% Use \sty{tracklang} to find out what languages have been loaded.
%    \begin{macrocode}
\RequirePackage{tracklang}
%    \end{macrocode}
% Also require \sty{etoolbox}.
%    \begin{macrocode}
\RequirePackage{etoolbox}
%    \end{macrocode}
% Need \sty{xkeyval} for \meta{key}=\meta{value} interface.
%    \begin{macrocode}
\RequirePackage{xkeyval}[2006/11/18]
%    \end{macrocode}
%
%\begin{macro}{\dtm@yearmonthsep}
% Separator between year and month for numeric dates.
%    \begin{macrocode}
\newcommand*{\dtm@yearmonthsep}{-}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\dtm@monthdaysep}
% Separator between month and day for numeric dates.
%    \begin{macrocode}
\newcommand*{\dtm@monthdaysep}{-}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\dtm@dayyearsep}
% Separator between day and year for numeric middle-endian dates.
%    \begin{macrocode}
\newcommand*{\dtm@dayyearsep}{-}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\dtm@hourminsep}
% Separator between the hour and minute for times.
%    \begin{macrocode}
\newcommand*{\dtm@hourminsep}{:}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\dtm@minsecsep}
% Separator between the minute and second for times.
%    \begin{macrocode}
\newcommand*{\dtm@minsecsep}{:}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\dtm@timezonesep}
% Separator between the date and time.
%    \begin{macrocode}
\newcommand*{\dtm@datetimesep}{\space}%
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\dtm@timezonesep}
% Separator between the time and time zone.
%    \begin{macrocode}
\newcommand*{\dtm@timezonesep}{}
%    \end{macrocode}
%\end{macro}
%
%\begin{option}{datesep}
% Set year/month and month/day separator.
%    \begin{macrocode}
\define@key{datetime2.sty}{datesep}{%
  \renewcommand*{\dtm@yearmonthsep}{#1}%
  \renewcommand*{\dtm@monthdaysep}{#1}%
  \renewcommand*{\dtm@dayyearsep}{#1}%
}
%    \end{macrocode}
%\end{option}
%
%\begin{option}{yearmonthsep}
% Set year/month separator.
%    \begin{macrocode}
\define@key{datetime2.sty}{yearmonthsep}{%
  \renewcommand*{\dtm@yearmonthsep}{#1}%
}
%    \end{macrocode}
%\end{option}
%
%\begin{option}{monthdaysep}
% Set month/day separator.
%    \begin{macrocode}
\define@key{datetime2.sty}{monthdaysep}{%
  \renewcommand*{\dtm@monthdaysep}{#1}%
}
%    \end{macrocode}
%\end{option}
%
%\begin{option}{dayyearsep}
% Set day/year separator for middle-endian dates.
%    \begin{macrocode}
\define@key{datetime2.sty}{dayyearsep}{%
  \renewcommand*{\dtm@dayyearsep}{#1}%
}
%    \end{macrocode}
%\end{option}
%
%\begin{option}{timesep}
% Set hour/minute and minute/second separator.
%    \begin{macrocode}
\define@key{datetime2.sty}{timesep}{%
  \renewcommand*{\dtm@hourminsep}{#1}%
  \renewcommand*{\dtm@minsecsep}{#1}%
}
%    \end{macrocode}
%\end{option}
%
%\begin{option}{hourminsep}
% Set hour/minute separator.
%    \begin{macrocode}
\define@key{datetime2.sty}{hourminsep}{%
  \renewcommand*{\dtm@hourminsep}{#1}%
}
%    \end{macrocode}
%\end{option}
%
%\begin{option}{minsecsep}
% Set minute/second separator.
%    \begin{macrocode}
\define@key{datetime2.sty}{minsecsep}{%
  \renewcommand*{\dtm@minsecsep}{#1}%
}
%    \end{macrocode}
%\end{option}
%
%\begin{option}{timezonesep}
% Set separator between the time and the time zone (used in
% \cs{DTMnow}).
%    \begin{macrocode}
\define@key{datetime2.sty}{timezonesep}{%
  \renewcommand*{\dtm@timezonesep}{#1}%
}
%    \end{macrocode}
%\end{option}
%
%\begin{option}{datetimesep}
% Set separator between the date and the time (used in
% \cs{DTMnow}).
%    \begin{macrocode}
\define@key{datetime2.sty}{datetimesep}{%
  \renewcommand*{\dtm@datetimesep}{#1}%
}
%    \end{macrocode}
%\end{option}
%
%\begin{option}{showseconds}
% Boolean key to determine whether or not to show the seconds.
%    \begin{macrocode}
\define@boolkey{datetime2.sty}[DTM]{showseconds}[true]{}
%    \end{macrocode}
%\end{option}
%
%\begin{option}{showdate}
% Boolean key to determine whether or not to show the date in
% \cs{DTMdisplay} and \cs{DTMDisplay}.
%    \begin{macrocode}
\define@boolkey{datetime2.sty}[DTM]{showdate}[true]{}
\DTMshowdatetrue
%    \end{macrocode}
%\end{option}
%
%\begin{option}{showzone}
% Boolean key to determine whether or not to show the time zone in
% \cs{DTMdisplay} and \cs{DTMDisplay}.
%    \begin{macrocode}
\define@boolkey{datetime2.sty}[DTM]{showzone}[true]{}
%    \end{macrocode}
%\end{option}
%
%\begin{option}{showisoZ}
% Boolean key to determine whether or not to use \texttt{Z} instead
% of \texttt{+00:00} for UTC in the \style{default}, \style{iso} or
% \style{pdf} styles. (Other styles may also use this.)
%    \begin{macrocode}
\define@boolkey{datetime2.sty}[DTM]{showisoZ}[true]{}
\DTMshowisoZtrue
%    \end{macrocode}
%\end{option}
%
% Switch off seconds and time zone if \cs{pdfcreationdate}
% isn't defined, otherwise switch on.
%    \begin{macrocode}
\ifdef\pdfcreationdate
{%
  \DTMshowsecondstrue
  \DTMshowzonetrue
}%
{%
  \DTMshowsecondsfalse
  \DTMshowzonefalse
}%
%    \end{macrocode}
%
%\begin{option}{showzoneminutes}
% Boolean key to determine whether or not to show the time zone
% minutes. (If \cs{DTMshowzonefalse} then this option is irrelevant.)
%    \begin{macrocode}
\define@boolkey{datetime2.sty}[DTM]{showzoneminutes}[true]{}
\DTMshowzoneminutestrue
%    \end{macrocode}
%\end{option}
%
%\begin{macro}{\DTMifcaseregional}
%\begin{definition}
%\cs{DTMifcaseregional}\marg{false}\marg{text}\marg{numeric}
%\end{definition}
% Determines if the user wants the language modules to set the
% regional format. The first argument \meta{false} indicates that
% they don't want the regional format set, the second argument
% \meta{text} indicates they want the textual format (e.g. 1st
% March, 2015 or March 1, 2005) and the third argument \meta{numeric}
% indicates they want the numeric format (e.g. 1/3/2015 or
% 3/1/2015). A change in the setting will only have an affect when
% the module is loaded and when \cs{date}\meta{language} is used to
% set the style. The default is false.
%    \begin{macrocode}
\newcommand*{\DTMifcaseregional}[3]{#1}
%    \end{macrocode}
%\end{macro}
%
%\begin{option}{useregional}
% Setting to determine whether or not to use the regional
% settings (if any are loaded).
%    \begin{macrocode}
\define@choicekey{datetime2.sty}{useregional}[\val\nr]%
 {false,text,numeric,num}[text]%
 {%
   \ifcase\nr\relax
     \renewcommand*{\DTMifcaseregional}[3]{##1}%
   \or
     \renewcommand*{\DTMifcaseregional}[3]{##2}%
   \or
     \renewcommand*{\DTMifcaseregional}[3]{##3}%
   \or
     \renewcommand*{\DTMifcaseregional}[3]{##3}%
   \fi
 }
%    \end{macrocode}
%\end{option}
%
%\begin{macro}{\@dtm@setusecalc}
%    \begin{macrocode}
\newcommand*{\@dtm@setusecalc}{%
  \renewcommand*{\@dtm@usecalc}{\RequirePackage{datetime2-calc}}%
}
%    \end{macrocode}
%\end{macro}
%\begin{macro}{\@dtm@usecalc}
%    \begin{macrocode}
\newcommand*{\@dtm@usecalc}{}
%    \end{macrocode}
%\end{macro}
% Disable attempt to load \sty{datetime2-calc} in the document.
%    \begin{macrocode}
\AtBeginDocument{%
  \@ifpackageloaded{datetime2-calc}%
  {%
    \renewcommand*{\@dtm@setusecalc}{}%
  }% 
  {%
    \renewcommand*{\@dtm@setusecalc}{%
      \PackageError{datetime2}{You must load `datetime2-calc'
      package to use option `showdow'}{Try one of the following:^^J
      pass `calc' option to `datetime2' package when you load it^^J
      or move `showdow' option to `datetime2' package option list^^J
      or move \string\DTLsetup\space to the preamble.}%
    }%
  }%
}
%    \end{macrocode}
%
%\begin{option}{calc}
% This option will load the \sty{datetime2-calc} which uses the
% \sty{pgfcalendar} package to compute the day of week and offsets.
% The package is loaded at the end of this one.
%    \begin{macrocode}
\DeclareOptionX{calc}{\@dtm@setusecalc}
%    \end{macrocode}
%\end{option}
%
%\begin{option}{showdow}
% Boolean key to determine whether or not to show the day of week
% for the styles that can show the day of week. If this is switched
% on, then \sty{datetime2-calc} is required. If this key is set later
% in the document with \cs{DTMsetup}, then the \sty{datetime2-calc}
% package must previously be loaded for it to have an effect.
%    \begin{macrocode}
\define@boolkey{datetime2.sty}[DTM]{showdow}[true]{%
  \ifDTMshowdow \@dtm@setusecalc \fi
}
\DTMshowdowfalse
%    \end{macrocode}
%\end{option}
%
%\begin{macro}{\@dtm@warning}
% Warning messages.
%    \begin{macrocode}
\newcommand*{\@dtm@warning}[1]{%
  \if@dtm@warn
    \PackageWarning{datetime2}{#1}%
  \fi
}
%    \end{macrocode}
%\end{macro}
%
%\begin{option}{warn}
% Allow user to suppress package warnings.
%    \begin{macrocode}
\define@boolkey{datetime2.sty}[@dtm@]{warn}[true]{}
\@dtm@warntrue
%    \end{macrocode}
%\end{option}
%
%\begin{macro}{\@dtm@initialstyle}
%    \begin{macrocode}
\newcommand*{\@dtm@initialstyle}{}
%    \end{macrocode}
%\end{macro}
%\begin{option}{style}
% Set the style. This automatically sets
% \pkgopt[false]{useregional}.
%    \begin{macrocode}
\define@key{datetime2.sty}{style}{%
  \renewcommand*{\@dtm@initialstyle}{#1}%
  \ifstrempty{#1}%
  {}%
  {%
    \renewcommand*{\DTMifcaseregional}[3]{##1}%
  }%
}
%    \end{macrocode}
%\end{option}
%
% Pass any unknown options to \sty{tracklang}.
% This will automatically switch the "useregional" setting to
% \texttt{text}.
%    \begin{macrocode}
\DeclareOptionX*{%
  \TrackPredefinedDialect{\CurrentOption}%
  \renewcommand*{\DTMifcaseregional}[3]{#2}%
}
%    \end{macrocode}
%
%Process options passed to this package:
%    \begin{macrocode}
\ProcessOptionsX
%    \end{macrocode}
%
% Disable \texttt{calc} option. If it's required, just load
% \sty{datetime2-calc} with \cs{usepackage}.
%    \begin{macrocode}
\disable@keys{datetime2.sty}{calc}
%    \end{macrocode}
% Disable \texttt{style} option. If it's required, just 
% use \cs{DTMsetup}.
%    \begin{macrocode}
\disable@keys{datetime2.sty}{style}
%    \end{macrocode}
%
% Provide a way to set options after package has been loaded.
%\begin{macro}{\DTMsetup}
%    \begin{macrocode}
\newcommand*{\DTMsetup}[1]{%
 \def\@dtm@usecalc{}%
 \setkeys{datetime2.sty}{#1}%
 \@dtm@usecalc
}
%    \end{macrocode}
%\end{macro}
%
%\subsection{Defaults}
% This section sets up the defaults.
%
%\begin{macro}{\@dtm@parsedate}
% Parse date in the format \meta{year}-\meta{month}-\meta{day}.
% The arguments are expanded. (This is redefined by
% \sty{datetime2-calc}.)
%    \begin{macrocode}
\def\@dtm@parsedate#1-#2-#3\@dtm@endparsedate{%
  \edef\@dtm@year{\number#1}%
  \edef\@dtm@month{\number#2}%
  \edef\@dtm@day{\number#3}%
  \def\@dtm@dow{-1}%
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\@dtm@parsetime}
% Define command to parse time in the format
% \meta{h}:\meta{m}:\meta{s}. The results are stored in
% \cs{@dtm@hour}, \cs{@dtm@minute} and \cs{@dtm@second}.
% The arguments are expanded.
%    \begin{macrocode}
\def\@dtm@parsetime#1:#2:#3\@dtm@endparsetime{%
  \edef\@dtm@hour{\number#1}%
  \edef\@dtm@minute{\number#2}%
  \edef\@dtm@second{\number#3}%
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\@dtm@parsetimezn}
% Define command to parse time in the format
% \meta{h}:\meta{m}:\meta{s} \meta{znh}:\meta{znm}. The results are stored in
% \cs{@dtm@hour}, \cs{@dtm@minute}, \cs{@dtm@second},
% \cs{@dtm@timezonehour} and \cs{@dtm@timezoneminute}.
% The arguments are expanded.
%    \begin{macrocode}
\def\@dtm@parsetimezn#1:#2:#3 #4\@dtm@endparsetimezn{%
  \@dtm@parsetime#1:#2:#3\@dtm@endparsetime
  \@dtm@parsezone{#4}%
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\@dtm@parsezone}
% Define command to parse time zone in the format
% \texttt{Z} or \meta{znh}:\meta{znm}. The results are stored in
% \cs{@dtm@timezonehour} and \cs{@dtm@timezoneminute}.
% The arguments are expanded in the event that registers are used.
%    \begin{macrocode}
\newcommand*{\@dtm@parsezone}[1]{%
  \ifstrequal{#1}{Z}%
  {%
    \def\@dtm@timezonehour{+00}%
    \def\@dtm@timezoneminute{00}%
  }%
  {%
    \@dtm@parse@zone#1\@dtm@endparse@zone
  }%
}
\def\@dtm@parse@zone#1:#2\@dtm@endparse@zone{%
  \edef\@dtm@timezonehour{\number#1}%
  \edef\@dtm@timezoneminute{\number#2}%
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\@dtm@parsetimestamp}
% Parse date and time in ISO format
%\meta{YYYY}-\meta{MM}-\meta{DD}T\meta{hh}:\meta{mm}:\meta{sec}\meta{time
%zone}
% where \meta{time zone} may be \texttt{Z} or in the form
% \meta{hh}:\meta{mm} (where \meta{hh} includes the sign).
%    \begin{macrocode}
\def\@dtm@parsetimestamp#1-#2-#3T#4:#5:#6#7#8\@dtm@endparsetimestamp{%
  \@dtm@parsedate#1-#2-#3\@dtm@endparsedate
  \@dtm@parsetime#4:#5:#6#7\@dtm@endparsetime
  \@dtm@parsezone{#8}%
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMsavefilemoddate}
% Not available for some engines.
%    \begin{macrocode}
\newcommand*{\DTMsavefilemoddate}[2]{%
  \@dtm@warning{Your TeX engine doesn't support accessing
  file modification dates}%
  \cslet{@dtm@#1@year}{0}%
  \cslet{@dtm@#1@month}{0}%
  \cslet{@dtm@#1@day}{0}%
  \cslet{@dtm@#1@dow}{-1}%
  \cslet{@dtm@#1@hour}{0}%
  \cslet{@dtm@#1@minute}{0}%
  \cslet{@dtm@#1@second}{0}%
  \cslet{@dtm@#1@TZhour}{0}%
  \cslet{@dtm@#1@TZminute}{0}%
}
%    \end{macrocode}
%\end{macro}
%
% Find out the current time. If PDF\LaTeX\ is being used, then it
% can be fetched from \cs{pdfcreationdate}
%    \begin{macrocode}
\ifdef\pdfcreationdate
{%
%    \end{macrocode}
% Define commands to parse \cs{pdfcreationdate}
%    \begin{macrocode}
  \def\@dtm@parsepdfdatetime#1:#2#3#4#5#6#7#8#9{%
    \def\@dtm@year{#2#3#4#5}%
    \def\@dtm@month{#6#7}%
    \def\@dtm@day{#8#9}%
    \@dtm@parsepdftime
  }
  \def\@dtm@parsepdftime#1#2#3#4#5#6#7\@dtm@endparsepdfdatetime{%
    \def\@dtm@hour{#1#2}%
    \def\@dtm@minute{#3#4}%
    \def\@dtm@second{#5#6}%
    \ifstrequal{#7}{Z}%
    {%
      \def\@dtm@timezonehour{00}%
      \def\@dtm@timezoneminute{00}%
    }%
    {%
      \@dtm@parsepdftimezone#7%
    }%
  }
  \def\@dtm@parsepdftimezone#1'#2'{%
    \def\@dtm@timezonehour{#1}%
    \def\@dtm@timezoneminute{#2}%
  }%
%    \end{macrocode}
% Now parse \cs{pdfcreationdate}
%    \begin{macrocode}
  \expandafter\@dtm@parsepdfdatetime\pdfcreationdate\@dtm@endparsepdfdatetime
%    \end{macrocode}
% Save the values.
%    \begin{macrocode}
  \let\@dtm@currentyear\@dtm@year
  \let\@dtm@currentmonth\@dtm@month
  \let\@dtm@currentday\@dtm@day
  \let\@dtm@currenthour\@dtm@hour
  \let\@dtm@currentminute\@dtm@minute
  \let\@dtm@currentsecond\@dtm@second
  \let\@dtm@currenttimezonehour\@dtm@timezonehour
  \let\@dtm@currenttimezoneminute\@dtm@timezoneminute
%
%    \end{macrocode}
% Lua\TeX\ doesn't provide \cs{pdffilemoddate} (but it does provide
% \cs{pdfcreationdate}).
%    \begin{macrocode}
  \ifdef\pdffilemoddate
  {%
    \renewcommand*{\DTMsavefilemoddate}[2]{%
      \expandafter\@dtm@parsepdfdatetime\pdffilemoddate{#2}\@dtm@endparsepdfdatetime
      \cslet{@dtm@#1@year}{\@dtm@year}%
      \cslet{@dtm@#1@month}{\@dtm@month}%
      \cslet{@dtm@#1@day}{\@dtm@day}%
      \cslet{@dtm@#1@dow}{\@dtm@dow}%
      \cslet{@dtm@#1@hour}{\@dtm@hour}%
      \cslet{@dtm@#1@minute}{\@dtm@minute}%
      \cslet{@dtm@#1@second}{\@dtm@second}%
      \cslet{@dtm@#1@TZhour}{\@dtm@timezonehour}%
      \cslet{@dtm@#1@TZminute}{\@dtm@timezoneminute}%
    }
  }%
  {%
%    \end{macrocode}
% Lua time zone information provided by \verb|%z| is OS dependent,
% so this might not work.
%    \begin{macrocode}
    \ifdef\directlua
    {
      \renewcommand*{\DTMsavefilemoddate}[2]{%
        \expandafter\@dtm@parseluadatetime
          \directlua{tex.print(os.date(
             "\expandafter\@gobble\string\%Y-%
              \expandafter\@gobble\string\%m-%
              \expandafter\@gobble\string\%d-%
              \expandafter\@gobble\string\%w
              \expandafter\@gobble\string\%H:%
              \expandafter\@gobble\string\%M:%
              \expandafter\@gobble\string\%S
              \expandafter\@gobble\string\%z",
            lfs.attributes("#2").modification))}%
         \@dtm@endparseluadatetime
         \cslet{@dtm@#1@year}{\@dtm@year}%
         \cslet{@dtm@#1@month}{\@dtm@month}%
         \cslet{@dtm@#1@day}{\@dtm@day}%
         \cslet{@dtm@#1@dow}{\@dtm@dow}%
         \cslet{@dtm@#1@hour}{\@dtm@hour}%
         \cslet{@dtm@#1@minute}{\@dtm@minute}%
         \cslet{@dtm@#1@second}{\@dtm@second}%
         \cslet{@dtm@#1@TZhour}{\@dtm@TZhour}%
         \cslet{@dtm@#1@TZminute}{\@dtm@TZminute}%
      }
      \def\@dtm@parseluadatetime#1-#2-#3-#4 #5:#6:#7 #8\@dtm@endparseluadatetime{%
         \edef\@dtm@year{\number#1}%
         \edef\@dtm@month{\number#2}%
         \edef\@dtm@day{\number#3}%
         \edef\@dtm@dow{\number#4}%
         \edef\@dtm@hour{\number#5}%
         \edef\@dtm@minute{\number#6}%
         \edef\@dtm@second{\number#7}%
         \@dtm@parseluatimezone#8000000\@dtm@endparseluatimezone
      }
      \def\@dtm@parseluatimezone#1#2#3#4#5#6{%
         \ifstrequal{#1}{+}%
         {%
           \def\@dtm@TZhour{#1#2#3}%
           \ifstrequal{#4}{:}%
           {%
              \def\@dtm@TZminute{#5#6}%
           }%
           {%
              \def\@dtm@TZminute{#4#5}%
           }%
         }%
         {%
           \ifstrequal{#1}{-}%
           {%
              \def\@dtm@TZhour{#1#2#3}%
              \ifstrequal{#4}{:}%
              {%
                 \def\@dtm@TZminute{#5#6}%
              }%
              {%
                 \def\@dtm@TZminute{#4#5}%
              }%
           }%
           {%
             \ifstrequal{#1}{Z}%
             {%
               \def\@dtm@TZhour{0}%
               \def\@dtm@TZminute{0}%
             }%
             {%
               \def\@dtm@TZhour{#1#2}%
               \ifstrequal{#3}{:}%
               {%
                  \def\@dtm@TZminute{#4#5}%
               }%
               {%
                  \def\@dtm@TZminute{#3#4}%
               }%
             }%
           }%
         }%
         \@@dtm@parseluatimezone
      }
      \def\@@dtm@parseluatimezone#1\@dtm@endparseluatimezone{%
      }
    }
    {}
  }%
}%
{%
%    \end{macrocode}
% \cs{pdfcreationdate} not defined. By a process of elimination, the
% \TeX\ engine is either \XeTeX\ or it's very old. (Lua\TeX\
% recognises \cs{pdfcreationdate}.) In this case, the
% seconds and time zone can't be obtained. The hour and minute need
% to be calculated from \TeX's \cs{time} primitive.
%    \begin{macrocode}
   \count@=\time\relax
   \divide\count@ by 60\relax
   \edef\@dtm@currenthour{\number\count@}%
   \multiply\count@ by -60\relax
   \advance\count@ by \time\relax
   \edef\@dtm@currentminute{\number\count@}%
   \newcommand*{\@dtm@currentsecond}{00}%
   \newcommand\@dtm@currenttimezonehour{00}%
   \newcommand\@dtm@currenttimezoneminute{00}%
%    \end{macrocode}
% Get the day, month and year from \TeX's primitives.
%    \begin{macrocode}
   \edef\@dtm@currentyear{\number\year}%
   \edef\@dtm@currentmonth{\number\month}%
   \edef\@dtm@currentday{\number\day}%
}
%    \end{macrocode}
% Make \cs{DTMsavefilemoddate} robust.
%    \begin{macrocode}
\robustify\DTMsavefilemoddate
%    \end{macrocode}
%
% Current day of week defaults to \texttt{-1} (that is, ignore it).
%\begin{macro}{\@dtm@currentdow}
%    \begin{macrocode}
\newcommand*{\@dtm@currentdow}{-1}
%    \end{macrocode}
%\end{macro}
%
% Allow \XeLaTeX\ users a way of manually setting the current time zone.
%\begin{macro}{\DTMsetcurrentzone}
%    \begin{macrocode}
\newcommand*{\DTMsetcurrentzone}[2]{%
  \renewcommand\@dtm@currenttimezonehour{#1}%
  \renewcommand\@dtm@currenttimezoneminute{#2}%
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\today}
%    \begin{macrocode}
\renewcommand*{\today}{%
 \DTMdisplaydate 
  {\@dtm@currentyear}%
  {\@dtm@currentmonth}%
  {\@dtm@currentday}%
  {\@dtm@currentdow}%
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\Today}
% First letter upper case version.
%    \begin{macrocode}
\newcommand*{\Today}{%
 \DTMDisplaydate 
  {\@dtm@currentyear}%
  {\@dtm@currentmonth}%
  {\@dtm@currentday}%
  {\@dtm@currentdow}%
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMdisplaydate}
%\begin{definition}
%\cs{DTMdisplaydate}\marg{year}\marg{month}\marg{day}\marg{day of
%week}
%\end{definition}
% Display the given date. If the day of week is negative, ignore it.
% The default style ignores it regardless.
%    \begin{macrocode}
\newcommand*\DTMdisplaydate[4]{%
  \number#1\dtm@yearmonthsep\DTMtwodigits{#2}\dtm@monthdaysep\DTMtwodigits{#3}%
}%
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMDisplaydate}
% First letter upper case version. Defaults to \cs{DTMdisplaydate}.
%    \begin{macrocode}
\newcommand*{\DTMDisplaydate}{\DTMdisplaydate}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMdate}
% Display date where date is specified in the format
%\meta{yyyy}-\meta{mm}-\meta{dd}. Use \cs{expandafter} in case
%argument is a control sequence containing the date.
% This command isn't expandable
%    \begin{macrocode}
\newrobustcmd*{\DTMdate}[1]{%
  \expandafter\@dtm@parsedate#1\@dtm@endparsedate
  \DTMdisplaydate{\@dtm@year}{\@dtm@month}{\@dtm@day}{\@dtm@dow}%
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMDate}
% Upper case version.
%    \begin{macrocode}
\newrobustcmd*{\DTMDate}[1]{%
  \expandafter\@dtm@parsedate#1\@dtm@endparsedate
  \DTMDisplaydate{\@dtm@year}{\@dtm@month}{\@dtm@day}{\@dtm@dow}%
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMcurrenttime}
% Display the current time.
%    \begin{macrocode}
\newcommand*{\DTMcurrenttime}{%
 \DTMdisplaytime
  {\@dtm@currenthour}%
  {\@dtm@currentminute}%
  {\@dtm@currentsecond}%
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMdisplaytime}
%\begin{definition}
%\cs{DTMdisplaytime}\marg{hour}\marg{minute}\marg{sec}
%\end{definition}
% Display the given time.
%    \begin{macrocode}
\newcommand*\DTMdisplaytime[3]{%
  \DTMtwodigits{#1}\dtm@hourminsep\DTMtwodigits{#2}%
  \ifDTMshowseconds\dtm@minsecsep\DTMtwodigits{#3}\fi
}%
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMtime}
% Display date where time is specified in the format
%\meta{hour}:\meta{minute}:\meta{seconds}. This uses \cs{expandafter} in case
%argument is a control sequence containing the time. Not expandable.
%    \begin{macrocode}
\newrobustcmd*{\DTMtime}[1]{%
  \@dtm@parsetime#1\@dtm@endparsetime
  \DTMdisplaytime{\@dtm@hour}{\@dtm@minute}{\@dtm@second}%
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMcurrentzone}
% Display the current time zone.
%    \begin{macrocode}
\newcommand*{\DTMcurrentzone}{%
 \DTMdisplayzone
  {\@dtm@currenttimezonehour}%
  {\@dtm@currenttimezoneminute}%
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMdisplayzone}
% Display time zone.
%    \begin{macrocode}
\newcommand*{\DTMdisplayzone}[2]{%
 \ifboolexpe
 { bool{DTMshowisoZ}
   and test{\ifnumequal{#1}{0}}
   and test{\ifnumequal{#2}{0}}
 }%
 {%
   Z%
 }%
 {%
  \ifnum#1<0\else+\fi\DTMtwodigits{#1}%
  \ifDTMshowzoneminutes\dtm@hourminsep\DTMtwodigits{#2}\fi
 }%
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMnow}
% Current date, time and time zone.
%    \begin{macrocode}
\newcommand*{\DTMnow}{%
 \DTMdisplay
 {\@dtm@currentyear}
 {\@dtm@currentmonth}
 {\@dtm@currentday}
 {\@dtm@currentdow}
 {\@dtm@currenthour}%
 {\@dtm@currentminute}%
 {\@dtm@currentsecond}%
 {\@dtm@currenttimezonehour}%
 {\@dtm@currenttimezoneminute}%
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMNow}
% Current date, time and time zone.
%    \begin{macrocode}
\newcommand*{\DTMNow}{%
 \DTMDisplay
 {\@dtm@currentyear}
 {\@dtm@currentmonth}
 {\@dtm@currentday}
 {\@dtm@currentdow}
 {\@dtm@currenthour}%
 {\@dtm@currentminute}%
 {\@dtm@currentsecond}%
 {\@dtm@currenttimezonehour}%
 {\@dtm@currenttimezoneminute}%
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMdisplay}
%\begin{definition}
%\cs{DTMdisplay}\marg{YYYY}\marg{MM}\marg{DD}\marg{DOW}\marg{hh}\marg{mm}\marg{ss}\newline\marg{TZh}\marg{TZm}
%\end{definition}
% Display the date and time.
%    \begin{macrocode}
\newcommand*{\DTMdisplay}[9]{%
 \ifDTMshowdate
   \DTMdisplaydate{#1}{#2}{#3}{#4}%
   \dtm@datetimesep
 \fi
 \DTMdisplaytime
  {#5}%
  {#6}%
  {#7}%
 \ifDTMshowzone
  \dtm@timezonesep
  \DTMdisplayzone
   {#8}%
   {#9}%
 \fi
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMDisplay}
%\begin{definition}
%\cs{DTMDisplay}\marg{YYYY}\marg{MM}\marg{DD}\marg{DOW}\marg{hh}\marg{mm}\marg{ss}\newline\marg{TZh}\marg{TZm}
%\end{definition}
% First letter upper case version. Defaults to \cs{DTMdisplay}.
%    \begin{macrocode}
\newcommand*{\DTMDisplay}{\DTMdisplay}
%    \end{macrocode}
%\end{macro}
%
%\subsection{Styles}
%
% Provide user level commands for displaying number as two digits.
% (Truncate if over 99, to allow for converting year to two digits).
%\begin{macro}{\DTMtwodigits}
%    \begin{macrocode}
\newcommand*{\DTMtwodigits}[1]{%
 \ifnum#1<0
  -\DTMtwodigits{-#1}%
 \else
   \ifnum#1<100
     \ifnum#1<10
       0\number#1
     \else
       \number#1
     \fi
   \else
%    \end{macrocode}
% \cs{numexpr} rounds rather than truncates integer division, which
% is a little awkward to get around in an expandable context.
%    \begin{macrocode}
     \ifnum\numexpr#1-(#1/100)*100<0
       \number\numexpr#1-((#1/100)-1)*100\relax
     \else
       \number\numexpr#1-(#1/100)*100\relax
     \fi
   \fi
 \fi
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMcentury}
% Expands to the given number divided by 100 rounded upwards (in
% absolute terms).
% Provided in case the user just wants the century.
%    \begin{macrocode}
\newcommand*{\DTMcentury}[1]{%
  \ifnum#1<0
    -\DTMcentury{-#1}%
  \else
    \ifnum\numexpr#1-(#1/100)*100<1
       \number\numexpr#1/100\relax
    \else
       \number\numexpr(#1/100)+1\relax
    \fi
  \fi
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMdivhundred}
% Expands to the given number modulo 100.
%    \begin{macrocode}
\newcommand*{\DTMdivhundred}[1]{%
  \ifnum#1<0
    -\DTMdivhundred{-#1}%
  \else
    \ifnum\numexpr#1-(#1/100)*100<0
       \number\numexpr(#1)/100-1\relax
    \else
       \number\numexpr((#1)/100)\relax
    \fi
  \fi
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMtexorpdfstring}
%Provide user with a command that will use \sty{hyperref}'s
%\cs{texorpdfstring} if \sty{hyperref} has been loaded. If
%\sty{hyperref} isn't loaded it just does the first argument.
%    \begin{macrocode}
\newcommand*{\DTMtexorpdfstring}[2]{#1}
\AtBeginDocument{%
  \@ifpackageloaded{hyperref}%
  {%
    \renewcommand*{\DTMtexorpdfstring}{\texorpdfstring}%
  }%
  {}%
}
%    \end{macrocode}
%\end{macro}
%
% Access separator:
%\begin{macro}{\DTMsep}
%    \begin{macrocode}
\newcommand*{\DTMsep}[1]{\csname dtm@#1sep\endcsname}
%    \end{macrocode}
%\end{macro}
%
% Date-only styles are stored internally as
% \cs{@dtm@datestyle@}\meta{label}, time-only styles are stored
% internally as \cs{@dtm@timestyle@}\meta{label}, zone-only styles
% are stored internally as \cs{@dtm@zonestyle@}\meta{label}.
%
%\begin{macro}{\DTMnewdatestyle}
% Define a new date-only style. This should only redefine
% \cs{DTMdisplaydate} and \cs{DTMDisplaydate}, which may or may not
% use the separators \cs{dtm@yearmonthsep} and \cs{dtm@monthdaysep}.
%    \begin{macrocode}
\newcommand*{\DTMnewdatestyle}[2]{%
  \ifcsdef{@dtm@datestyle@#1}%
  {%
    \PackageError{datetime2}{Date style `#1' already exists}{}%
  }%
  {%
     \csdef{@dtm@datestyle@#1}{#2}%
  }%
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMnewtimestyle}
% Define a new time-only style. This should only redefine
% \cs{DTMdisplaytime}, which may or may not use the separators
% \cs{dtm@hourminsep} and \cs{dtm@minsecsep}.
%    \begin{macrocode}
\newcommand*{\DTMnewtimestyle}[2]{%
  \ifcsdef{@dtm@timestyle@#1}%
  {%
    \PackageError{datetime2}{Time style `#1' already exists}{}%
  }%
  {%
     \csdef{@dtm@timestyle@#1}{#2}%
  }%
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMnewtimezone}
% Define a new zone-only style. This should only redefine
% \cs{DTMdisplayzone}, which may or may not use the separator
% \cs{dtm@hourminsep}.
%    \begin{macrocode}
\newcommand*{\DTMnewzonestyle}[2]{%
  \ifcsdef{@dtm@zonestyle@#1}%
  {%
    \PackageError{datetime2}{Zone style `#1' already exists}{}%
  }%
  {%
     \csdef{@dtm@zonestyle@#1}{#2}%
  }%
}
%    \end{macrocode}
%\end{macro}
%
% Zone styles may use mappings to use a~regional time zone (such as
% GMT or BST). It's up to the language modules to define these
% mappings. A~mapping for time zone \meta{TZh}:\meta{TZm} is stored in 
% \cs{@dtm@zonemap@}\meta{TZh}\texttt{:}\meta{TZm}.
%\begin{macro}{\DTMdefzonemap}
%\begin{definition}
%\cs{DTMdefzonemap}\marg{TZh}\marg{TZm}\marg{map}
%\end{definition}
% This will override any previous mapping for the given time zone.
%    \begin{macrocode}
\newcommand*{\DTMdefzonemap}[3]{%
  \csdef{@dtm@zonemap@\DTMtwodigits{#1}:\DTMtwodigits{#2}}{#3}%
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMusezonemapordefault}
% Expands to the mapping or the default if not defined.
%    \begin{macrocode}
\newcommand*{\DTMusezonemapordefault}[2]{%
  \ifcsundef{@dtm@zonemap@\DTMtwodigits{#1}:\DTMtwodigits{#2}}%
  {%
    \ifnum#1<0\else+\fi
    \DTMtwodigits{#1}%
    \ifDTMshowzoneminutes\DTMsep{hourmin}\DTMtwodigits{#2}\fi
  }%
  {\csname @dtm@zonemap@\DTMtwodigits{#1}:\DTMtwodigits{#2}\endcsname}%
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMusezonemap}
% Expands to the mapping. (No check if defined.)
%    \begin{macrocode}
\newcommand*{\DTMusezonemap}[2]{%
  \csname @dtm@zonemap@\DTMtwodigits{#1}:\DTMtwodigits{#2}\endcsname
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMhaszonemap}
%    \begin{macrocode}
\newcommand*{\DTMhaszonemap}[4]{%
  \ifcsundef{@dtm@zonemap@\DTMtwodigits{#1}:\DTMtwodigits{#2}}{#4}{#3}%
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMclearmap}
% Undefines the given zone mapping. No check is made to determine if
% the map exists.
%    \begin{macrocode}
\newcommand*{\DTMclearmap}[2]{%
 \csundef{@dtm@zonemap@\DTMtwodigits{#1}:\DTMtwodigits{#2}}%
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMshowmap}
%Debugging command.
%    \begin{macrocode}
\newcommand*{\DTMshowmap}[2]{%
 \csshow{@dtm@zonemap@\DTMtwodigits{#1}:\DTMtwodigits{#2}}%
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMresetzones}
% Regional modules should use this before setting their local zones,
% so that users can unset previously defined zones that are outside
% the region if they require. By default this does nothing, so no
% modifications are made.
%    \begin{macrocode}
\newcommand*{\DTMresetzones}{}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMNatoZoneMaps}
% Provide a command to set the time zone abbreviations to the
% military\slash NATO style.
%    \begin{macrocode}
\newcommand*{\DTMNatoZoneMaps}{%
  \defzonemap{01}{00}{A}% Alpha time zone
  \defzonemap{02}{00}{B}% Bravo time zone
  \defzonemap{03}{00}{C}% Charlie time zone
  \defzonemap{04}{00}{D}% Delta time zone
  \defzonemap{05}{00}{E}% Echo time zone
  \defzonemap{06}{00}{F}% Foxtrot time zone
  \defzonemap{07}{00}{G}% Golf time zone
  \defzonemap{08}{00}{H}% Hotel time zone
  \defzonemap{09}{00}{I}% India time zone
  \defzonemap{10}{00}{K}% Kilo time zone
  \defzonemap{11}{00}{L}% Lima time zone
  \defzonemap{12}{00}{M}% Mike time zone
  \defzonemap{-01}{00}{N}% November time zone
  \defzonemap{-02}{00}{O}% Oscar time zone
  \defzonemap{-03}{00}{P}% Papa time zone
  \defzonemap{-04}{00}{Q}% Quebec time zone
  \defzonemap{-05}{00}{R}% Romeo time zone
  \defzonemap{-06}{00}{S}% Sierra time zone
  \defzonemap{-07}{00}{T}% Tango time zone
  \defzonemap{-08}{00}{U}% Uniform time zone
  \defzonemap{-09}{00}{V}% Victor time zone
  \defzonemap{-10}{00}{W}% Whiskey time zone
  \defzonemap{-11}{00}{X}% X-ray time zone
  \defzonemap{-12}{00}{Y}% Yankee time zone
  \defzonemap{00}{00}{Z}% Zulu time zone
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMnewstyle}
%\begin{definition}
%\cs{DTMnewstyle}\marg{label}\marg{date style definition}\marg{time
%style definition}\marg{zone style definition}\marg{full format
%definition}
%\end{definition}
% Define a new style. The full format redefines \cs{DTMdisplay}
% and \cs{DTMDisplay}.
%    \begin{macrocode}
\newcommand*{\DTMnewstyle}[5]{%
  \ifcsdef{@dtm@style@#1}%
  {%
    \PackageError{datetime2}{Style `#1' already exists}{}%
  }%
  {%
    \DTMnewdatestyle{#1}{#2}%
    \DTMnewtimestyle{#1}{#3}%
    \DTMnewzonestyle{#1}{#4}%
     \csdef{@dtm@style@#1}{%
        \csuse{@dtm@datestyle@#1}%
        \csuse{@dtm@timestyle@#1}%
        \csuse{@dtm@zonestyle@#1}%
        #5%
     }%
  }%
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMsetdatestyle}
%    \begin{macrocode}
\newrobustcmd*{\DTMsetdatestyle}[1]{%
  \ifcsdef{@dtm@datestyle@#1}%
  {\csuse{@dtm@datestyle@#1}}%
  {%
    \PackageError{datetime2}{Date style `#1' not defined}{}%
  }%
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMsettimestyle}
%    \begin{macrocode}
\newrobustcmd*{\DTMsettimestyle}[1]{%
  \ifcsdef{@dtm@timestyle@#1}%
  {\csuse{@dtm@timestyle@#1}}%
  {%
    \PackageError{datetime2}{Time style `#1' not defined}{}%
  }%
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMsetzonestyle}
%    \begin{macrocode}
\newrobustcmd*{\DTMsetzonestyle}[1]{%
  \ifcsdef{@dtm@zonestyle@#1}%
  {\csuse{@dtm@zonestyle@#1}}%
  {%
    \PackageError{datetime2}{Zone style `#1' not defined}{}%
  }%
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMsetstyle}
%    \begin{macrocode}
\newrobustcmd*{\DTMsetstyle}[1]{%
  \ifcsdef{@dtm@style@#1}%
  {\csuse{@dtm@style@#1}}%
  {%
     \let\dtm@unknownstyle\@dtm@unknownstyle
     \ifcsdef{@dtm@datestyle#1}%
       {\csuse{@dtm@datestyle@#1}\let\dtm@unknownstyle\@dtm@unknown@style}%
       {\@dtm@warning{No date style `#1' defined}}%
     \ifcsdef{@dtm@timestyle#1}%
       {\csuse{@dtm@timestyle@#1}\let\dtm@unknownstyle\@dtm@unknown@style}%
       {\@dtm@warning{No time style `#1' defined}}%
     \ifcsdef{@dtm@zonestyle#1}%
       {\csuse{@dtm@zonestyle@#1}\let\dtm@unknownstyle\@dtm@unknown@style}%
       {\@dtm@warning{No zone style `#1' defined}}%
     \dtm@unknownstyle{#1}%
  }%
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\@dtm@unknownstyle}
%    \begin{macrocode}
\newcommand*{\@dtm@unknownstyle}[1]{%
  \PackageError{datetime2}{Unknown style `#1'}{}%
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\@dtm@unknown@style}
%    \begin{macrocode}
\newcommand*{\@dtm@unknown@style}[1]{%
  \@dtm@warning{No full style `#1' defined}{}%
}
%    \end{macrocode}
%\end{macro}
%
% Define \style{default} style:
%    \begin{macrocode}
\DTMnewstyle
 {default}%label
 {% date style
    \renewcommand*\DTMdisplaydate[4]{%
      \number##1\DTMsep{yearmonth}\DTMtwodigits{##2}%
      \DTMsep{monthday}\DTMtwodigits{##3}%
    }%
    \renewcommand*{\DTMDisplaydate}{\DTMdisplaydate}%
 }%
 {% time style
    \renewcommand*\DTMdisplaytime[3]{%
      \DTMtwodigits{##1}\DTMsep{hourmin}\DTMtwodigits{##2}%
      \ifDTMshowseconds\DTMsep{minsec}\DTMtwodigits{##3}\fi
    }%
 }%
 {% zone style
   \renewcommand*{\DTMdisplayzone}[2]{%
     \ifboolexpe
     { bool{DTMshowisoZ}
       and test{\ifnumequal{##1}{0}}
       and test{\ifnumequal{##2}{0}}
     }%
     {%
       Z%
     }%
     {%
      \ifnum##1<0\else+\fi\DTMtwodigits{##1}%
      \ifDTMshowzoneminutes\DTMsep{hourmin}\DTMtwodigits{##2}\fi
     }%
   }%
 }%
 {% full style
   \renewcommand*{\DTMdisplay}[9]{%
    \ifDTMshowdate
     \DTMdisplaydate{##1}{##2}{##3}{##4}%
     \DTMsep{datetime}%
    \fi
    \DTMdisplaytime
     {##5}%
     {##6}%
     {##7}%
    \ifDTMshowzone
     \DTMsep{timezone}%
     \DTMdisplayzone
      {##8}%
      {##9}%
    \fi
   }%
   \renewcommand*{\DTMDisplay}{\DTMdisplay}%
 }
%    \end{macrocode}
%
% Define \style{iso} style which ignores the separator settings:
%    \begin{macrocode}
\DTMnewstyle
 {iso}%label
 {% date style
    \renewcommand*\DTMdisplaydate[4]{%
      \number##1-\DTMtwodigits{##2}-\DTMtwodigits{##3}%
    }%
    \renewcommand*{\DTMDisplaydate}{\DTMdisplaydate}%
 }%
 {% time style
    \renewcommand*\DTMdisplaytime[3]{%
      \DTMtwodigits{##1}:\DTMtwodigits{##2}%
      \ifDTMshowseconds:\DTMtwodigits{##3}\fi
    }%
 }%
 {% zone style
   \renewcommand*{\DTMdisplayzone}[2]{%
     \ifboolexpe
     { bool{DTMshowisoZ}
       and test{\ifnumequal{##1}{0}}
       and test{\ifnumequal{##2}{0}}
     }%
     {%
       Z%
     }%
     {%
      \ifnum##1<0\else+\fi\DTMtwodigits{##1}%
      \ifDTMshowzoneminutes:\DTMtwodigits{##2}\fi
     }%
   }%
 }%
 {% full style
   \renewcommand*{\DTMdisplay}[9]{%
    \ifDTMshowdate
     \DTMdisplaydate{##1}{##2}{##3}{##4}%
     T%
    \fi
    \DTMdisplaytime
     {##5}%
     {##6}%
     {##7}%
    \ifDTMshowzone
     \DTMdisplayzone
      {##8}%
      {##9}%
    \fi
   }%
   \renewcommand*{\DTMDisplay}{\DTMdisplay}%
 }
%    \end{macrocode}
%
% Define \style{pdf} style which converts into a format that can be
% used in \cs{pdfinfo}:
%    \begin{macrocode}
\DTMnewstyle
 {pdf}%label
 {% date style
    \renewcommand*\DTMdisplaydate[4]{%
      D:\number##1 % space intended
      \DTMtwodigits{##2}\DTMtwodigits{##3}%
    }%
    \renewcommand*{\DTMDisplaydate}{\DTMdisplaydate}%
 }%
 {% time style
    \renewcommand*\DTMdisplaytime[3]{%
      \DTMtwodigits{##1}\DTMtwodigits{##2}\DTMtwodigits{##3}%
    }%
 }%
 {% zone style
   \renewcommand*{\DTMdisplayzone}[2]{%
     \ifboolexpe
     { bool{DTMshowisoZ}
       and test{\ifnumequal{##1}{0}}
       and test{\ifnumequal{##2}{0}}
     }%
     {%
       Z%
     }%
     {%
      \ifnum##1<0\else+\fi\DTMtwodigits{##1}'\DTMtwodigits{##2}'%
     }%
   }%
 }%
 {% full style
   \renewcommand*{\DTMdisplay}[9]{%
    \DTMdisplaydate{##1}{##2}{##3}{##4}%
    \DTMdisplaytime{##5}{##6}{##7}%
    \DTMdisplayzone{##8}{##9}%
   }%
   \renewcommand*{\DTMDisplay}{\DTMdisplay}%
 }
%    \end{macrocode}
%
% Define \style{yyyymd} style:
%    \begin{macrocode}
\DTMnewstyle
 {yyyymd}%label
 {% date style
    \renewcommand*\DTMdisplaydate[4]{%
      \number##1
      \DTMsep{yearmonth}%
      \number##2
      \DTMsep{monthday}%
      \number##3
    }%
    \renewcommand*{\DTMDisplaydate}{\DTMdisplaydate}%
 }%
 {% time style
    \renewcommand*\DTMdisplaytime[3]{%
      \DTMtwodigits{##1}\DTMsep{hourmin}\DTMtwodigits{##2}%
      \ifDTMshowseconds\DTMsep{minsec}\DTMtwodigits{##3}\fi
    }%
 }%
 {% zone style
   \renewcommand*{\DTMdisplayzone}[2]{%
     \ifboolexpe
     { bool{DTMshowisoZ}
       and test{\ifnumequal{##1}{0}}
       and test{\ifnumequal{##2}{0}}
     }%
     {%
       Z%
     }%
     {%
      \ifnum##1<0\else+\fi\DTMtwodigits{##1}%
      \ifDTMshowzoneminutes\DTMsep{hourmin}\DTMtwodigits{##2}\fi
     }%
   }%
 }%
 {% full style
   \renewcommand*{\DTMdisplay}[9]{%
    \ifDTMshowdate
     \DTMdisplaydate{##1}{##2}{##3}{##4}%
     \DTMsep{datetime}%
    \fi
    \DTMdisplaytime
     {##5}%
     {##6}%
     {##7}%
    \ifDTMshowzone
     \DTMsep{timezone}%
     \DTMdisplayzone
      {##8}%
      {##9}%
    \fi
   }%
   \renewcommand*{\DTMDisplay}{\DTMdisplay}%
 }
%    \end{macrocode}
%
% Define \style{ddmmyyyy} style:
%    \begin{macrocode}
\DTMnewstyle
 {ddmmyyyy}%label
 {% date style
    \renewcommand*\DTMdisplaydate[4]{%
      \DTMtwodigits{##3}\DTMsep{monthday}%
      \DTMtwodigits{##2}\DTMsep{yearmonth}%
      \number##1
    }%
    \renewcommand*{\DTMDisplaydate}{\DTMdisplaydate}%
 }%
 {% time style
    \renewcommand*\DTMdisplaytime[3]{%
      \DTMtwodigits{##1}\DTMsep{hourmin}\DTMtwodigits{##2}%
      \ifDTMshowseconds\DTMsep{minsec}\DTMtwodigits{##3}\fi
    }%
 }%
 {% zone style
   \renewcommand*{\DTMdisplayzone}[2]{%
     \ifboolexpe
     { bool{DTMshowisoZ}
       and test{\ifnumequal{##1}{0}}
       and test{\ifnumequal{##2}{0}}
     }%
     {%
       Z%
     }%
     {%
      \ifnum##1<0\else+\fi\DTMtwodigits{##1}%
      \ifDTMshowzoneminutes\DTMsep{hourmin}\DTMtwodigits{##2}\fi
     }%
   }%
 }%
 {% full style
   \renewcommand*{\DTMdisplay}[9]{%
    \ifDTMshowdate
     \DTMdisplaydate{##1}{##2}{##3}{##4}%
     \DTMsep{datetime}%
    \fi
    \DTMdisplaytime
     {##5}%
     {##6}%
     {##7}%
    \ifDTMshowzone
     \DTMsep{timezone}%
     \DTMdisplayzone
      {##8}%
      {##9}%
    \fi
   }%
   \renewcommand*{\DTMDisplay}{\DTMdisplay}%
 }
%    \end{macrocode}
%
% Define \style{dmyyyy} style:
%    \begin{macrocode}
\DTMnewstyle
 {dmyyyy}%label
 {% date style
    \renewcommand*\DTMdisplaydate[4]{%
      \number##3
      \DTMsep{monthday}%
      \number##2
      \DTMsep{yearmonth}%
      \number##1
    }%
    \renewcommand*{\DTMDisplaydate}{\DTMdisplaydate}%
 }%
 {% time style
    \renewcommand*\DTMdisplaytime[3]{%
      \DTMtwodigits{##1}\DTMsep{hourmin}\DTMtwodigits{##2}%
      \ifDTMshowseconds\DTMsep{minsec}\DTMtwodigits{##3}\fi
    }%
 }%
 {% zone style
   \renewcommand*{\DTMdisplayzone}[2]{%
     \ifboolexpe
     { bool{DTMshowisoZ}
       and test{\ifnumequal{##1}{0}}
       and test{\ifnumequal{##2}{0}}
     }%
     {%
       Z%
     }%
     {%
      \ifnum##1<0\else+\fi\DTMtwodigits{##1}%
      \ifDTMshowzoneminutes\DTMsep{hourmin}\DTMtwodigits{##2}\fi
     }%
   }%
 }%
 {% full style
   \renewcommand*{\DTMdisplay}[9]{%
    \ifDTMshowdate
     \DTMdisplaydate{##1}{##2}{##3}{##4}%
     \DTMsep{datetime}%
    \fi
    \DTMdisplaytime
     {##5}%
     {##6}%
     {##7}%
    \ifDTMshowzone
     \DTMsep{timezone}%
     \DTMdisplayzone
      {##8}%
      {##9}%
    \fi
   }%
   \renewcommand*{\DTMDisplay}{\DTMdisplay}%
 }
%    \end{macrocode}
%
% Define \style{dmyy} style:
%    \begin{macrocode}
\DTMnewstyle
 {dmyy}%label
 {% date style
    \renewcommand*\DTMdisplaydate[4]{%
      \number##3 % space intended
      \DTMsep{monthday}%
      \number##2 % space intended
      \DTMsep{yearmonth}%
      \DTMtwodigits{##1}%
    }%
    \renewcommand*{\DTMDisplaydate}{\DTMdisplaydate}%
 }%
 {% time style
    \renewcommand*\DTMdisplaytime[3]{%
      \DTMtwodigits{##1}\DTMsep{hourmin}\DTMtwodigits{##2}%
      \ifDTMshowseconds\DTMsep{minsec}\DTMtwodigits{##3}\fi
    }%
 }%
 {% zone style
   \renewcommand*{\DTMdisplayzone}[2]{%
     \ifboolexpe
     { bool{DTMshowisoZ}
       and test{\ifnumequal{##1}{0}}
       and test{\ifnumequal{##2}{0}}
     }%
     {%
       Z%
     }%
     {%
      \ifnum##1<0\else+\fi\DTMtwodigits{##1}%
      \ifDTMshowzoneminutes\DTMsep{hourmin}\DTMtwodigits{##2}\fi
     }%
   }%
 }%
 {% full style
   \renewcommand*{\DTMdisplay}[9]{%
    \ifDTMshowdate
     \DTMdisplaydate{##1}{##2}{##3}{##4}%
     \DTMsep{datetime}%
    \fi
    \DTMdisplaytime
     {##5}%
     {##6}%
     {##7}%
    \ifDTMshowzone
     \DTMsep{timezone}%
     \DTMdisplayzone
      {##8}%
      {##9}%
    \fi
   }%
   \renewcommand*{\DTMDisplay}{\DTMdisplay}%
 }
%    \end{macrocode}
%
% Define \style{mmddyyyy} style:
%    \begin{macrocode}
\DTMnewstyle
 {mmddyyyy}%label
 {% date style
    \renewcommand*\DTMdisplaydate[4]{%
      \DTMtwodigits{##2}\DTMsep{monthday}%
      \DTMtwodigits{##3}\DTMsep{dayyear}%
      \number##1
    }%
    \renewcommand*{\DTMDisplaydate}{\DTMdisplaydate}%
 }%
 {% time style
    \renewcommand*\DTMdisplaytime[3]{%
      \DTMtwodigits{##1}\DTMsep{hourmin}\DTMtwodigits{##2}%
      \ifDTMshowseconds\DTMsep{minsec}\DTMtwodigits{##3}\fi
    }%
 }%
 {% zone style
   \renewcommand*{\DTMdisplayzone}[2]{%
     \ifboolexpe
     { bool{DTMshowisoZ}
       and test{\ifnumequal{##1}{0}}
       and test{\ifnumequal{##2}{0}}
     }%
     {%
       Z%
     }%
     {%
      \ifnum##1<0\else+\fi\DTMtwodigits{##1}%
      \ifDTMshowzoneminutes\DTMsep{hourmin}\DTMtwodigits{##2}\fi
     }%
   }%
 }%
 {% full style
   \renewcommand*{\DTMdisplay}[9]{%
    \ifDTMshowdate
     \DTMdisplaydate{##1}{##2}{##3}{##4}%
     \DTMsep{datetime}%
    \fi
    \DTMdisplaytime
     {##5}%
     {##6}%
     {##7}%
    \ifDTMshowzone
     \DTMsep{timezone}%
     \DTMdisplayzone
      {##8}%
      {##9}%
    \fi
   }%
   \renewcommand*{\DTMDisplay}{\DTMdisplay}%
 }
%    \end{macrocode}
%
% Define \style{mdyyyy} style:
%    \begin{macrocode}
\DTMnewstyle
 {mdyyyy}%label
 {% date style
    \renewcommand*\DTMdisplaydate[4]{%
      \number##2 % space intended
      \DTMsep{monthday}%
      \number##3 % space intended
      \DTMsep{dayyear}%
      \number##1 % space intended
    }%
    \renewcommand*{\DTMDisplaydate}{\DTMdisplaydate}%
 }%
 {% time style
    \renewcommand*\DTMdisplaytime[3]{%
      \DTMtwodigits{##1}\DTMsep{hourmin}\DTMtwodigits{##2}%
      \ifDTMshowseconds\DTMsep{minsec}\DTMtwodigits{##3}\fi
    }%
 }%
 {% zone style
   \renewcommand*{\DTMdisplayzone}[2]{%
     \ifboolexpe
     { bool{DTMshowisoZ}
       and test{\ifnumequal{##1}{0}}
       and test{\ifnumequal{##2}{0}}
     }%
     {%
       Z%
     }%
     {%
      \ifnum##1<0\else+\fi\DTMtwodigits{##1}%
      \ifDTMshowzoneminutes\DTMsep{hourmin}\DTMtwodigits{##2}\fi
     }%
   }%
 }%
 {% full style
   \renewcommand*{\DTMdisplay}[9]{%
    \ifDTMshowdate
     \DTMdisplaydate{##1}{##2}{##3}{##4}%
     \DTMsep{datetime}%
    \fi
    \DTMdisplaytime
     {##5}%
     {##6}%
     {##7}%
    \ifDTMshowzone
     \DTMsep{timezone}%
     \DTMdisplayzone
      {##8}%
      {##9}%
    \fi
   }%
   \renewcommand*{\DTMDisplay}{\DTMdisplay}%
 }
%    \end{macrocode}
%
% Define \style{mdyy} style:
%    \begin{macrocode}
\DTMnewstyle
 {mdyy}%label
 {% date style
    \renewcommand*\DTMdisplaydate[4]{%
      \number##2 % space intended
      \DTMsep{monthday}%
      \number##3 % space intended
      \DTMsep{dayyear}%
      \DTMtwodigits{##1}%
    }%
    \renewcommand*{\DTMDisplaydate}{\DTMdisplaydate}%
 }%
 {% time style
    \renewcommand*\DTMdisplaytime[3]{%
      \DTMtwodigits{##1}\DTMsep{hourmin}\DTMtwodigits{##2}%
      \ifDTMshowseconds\DTMsep{minsec}\DTMtwodigits{##3}\fi
    }%
 }%
 {% zone style
   \renewcommand*{\DTMdisplayzone}[2]{%
     \ifboolexpe
     { bool{DTMshowisoZ}
       and test{\ifnumequal{##1}{0}}
       and test{\ifnumequal{##2}{0}}
     }%
     {%
       Z%
     }%
     {%
      \ifnum##1<0\else+\fi\DTMtwodigits{##1}%
      \ifDTMshowzoneminutes\DTMsep{hourmin}\DTMtwodigits{##2}\fi
     }%
   }%
 }%
 {% full style
   \renewcommand*{\DTMdisplay}[9]{%
    \ifDTMshowdate
     \DTMdisplaydate{##1}{##2}{##3}{##4}%
     \DTMsep{datetime}%
    \fi
    \DTMdisplaytime
     {##5}%
     {##6}%
     {##7}%
    \ifDTMshowzone
     \DTMsep{timezone}%
     \DTMdisplayzone
      {##8}%
      {##9}%
    \fi
   }%
   \renewcommand*{\DTMDisplay}{\DTMdisplay}%
 }
%    \end{macrocode}
%
% Define \style{hmmss} time style
%    \begin{macrocode}
\DTMnewtimestyle
 {hmmss}% label
 {% 
    \renewcommand*\DTMdisplaytime[3]{%
      \number##1
      \DTMsep{hourmin}\DTMtwodigits{##2}%
      \ifDTMshowseconds\DTMsep{minsec}\DTMtwodigits{##3}\fi
    }%
 }%
%    \end{macrocode}
%
% Define \style{map} zone style
%    \begin{macrocode}
\DTMnewzonestyle
 {map}% label
 {% 
    \renewcommand*\DTMdisplaytime[3]{%
      \DTMusezonemapordefault{##1}{##2}%
    }%
 }%
%    \end{macrocode}
%
% Define \style{hhmm} zone style
%    \begin{macrocode}
\DTMnewzonestyle
 {hhmm}% label
 {%
    \renewcommand*\DTMdisplaytime[3]{%
      \ifnum##1<0\else+\fi\DTMtwodigits{##1}%
      \ifDTMshowzoneminutes\DTMsep{hourmin}\DTMtwodigits{##2}\fi
    }%
 }
%    \end{macrocode}
%
%\subsection{Saving and Using Dates}
% Date and time information is stored in control sequences in the
% form \cs{@dtm@}\meta{label}\texttt{@}\meta{tag}, where
% \meta{label} is the label uniquely identifying the information and
% \meta{tag} is the element (\texttt{year}, \texttt{month},
% \texttt{day}, \texttt{dow}, \texttt{hour}, \texttt{minute},
% \texttt{second}, \texttt{TZhour} and \texttt{TZminute}). Missing
% information is stored as \texttt{0} (except for the day of week, which is
% stored as \texttt{-1}).
%
%\begin{macro}{\DTMsavedate}
% Save the date specified in the format
% \meta{yyyy}-\meta{mm}-\meta{dd}. \cs{expandafter} is used in case
% the argument is a control sequence storing the date. This will
% redefine an existing saved date with the same label. The first
% argument is the label.
%    \begin{macrocode}
\newrobustcmd*{\DTMsavedate}[2]{%
  \expandafter\@dtm@parsedate#2\@dtm@endparsedate
  \cslet{@dtm@#1@year}{\@dtm@year}%
  \cslet{@dtm@#1@month}{\@dtm@month}%
  \cslet{@dtm@#1@day}{\@dtm@day}%
  \cslet{@dtm@#1@dow}{\@dtm@dow}%
  \ifcsundef{@dtm@#1@hour}{\csdef{@dtm@#1@hour}{0}}{}%
  \ifcsundef{@dtm@#1@minute}{\csdef{@dtm@#1@minute}{0}}{}%
  \ifcsundef{@dtm@#1@second}{\csdef{@dtm@#1@second}{0}}{}%
  \ifcsundef{@dtm@#1@TZhour}{\csdef{@dtm@#1@TZhour}{0}}{}%
  \ifcsundef{@dtm@#1@TZminute}{\csdef{@dtm@#1@TZminute}{0}}{}%
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMsavenoparsedate}
% Save the date without parsing the
% \meta{YYYY}-\meta{MM}-\meta{DD} format.
%    \begin{macrocode}
\newrobustcmd*{\DTMsavenoparsedate}[5]{%
  \csedef{@dtm@#1@year}{\number#2}%
  \csedef{@dtm@#1@month}{\number#3}%
  \csedef{@dtm@#1@day}{\number#4}%
  \csedef{@dtm@#1@dow}{\number#5}%
  \ifcsundef{@dtm@#1@hour}{\csdef{@dtm@#1@hour}{0}}{}%
  \ifcsundef{@dtm@#1@minute}{\csdef{@dtm@#1@minute}{0}}{}%
  \ifcsundef{@dtm@#1@second}{\csdef{@dtm@#1@second}{0}}{}%
  \ifcsundef{@dtm@#1@TZhour}{\csdef{@dtm@#1@TZhour}{0}}{}%
  \ifcsundef{@dtm@#1@TZminute}{\csdef{@dtm@#1@TZminute}{0}}{}%
}
%    \end{macrocode}
%\end{macro}
%\begin{macro}{\DTMsavetime}
% Save the time specified in the format
% \meta{hh}:\meta{mm}:\meta{ss}. \cs{expandafter} is used in case
% the argument is a control sequence storing the date. This will
% redefine an existing saved date with the same label. The first
% argument is the label.
%    \begin{macrocode}
\newrobustcmd*{\DTMsavetime}[2]{%
  \expandafter\@dtm@parsetime#2\@dtm@endparsetime
  \cslet{@dtm@#1@hour}{\@dtm@hour}%
  \cslet{@dtm@#1@minute}{\@dtm@minute}%
  \cslet{@dtm@#1@second}{\@dtm@second}%
  \ifcsundef{@dtm@#1@year}{\csdef{@dtm@#1@year}{0}}{}%
  \ifcsundef{@dtm@#1@month}{\csdef{@dtm@#1@month}{0}}{}%
  \ifcsundef{@dtm@#1@day}{\csdef{@dtm@#1@day}{0}}{}%
  \ifcsundef{@dtm@#1@dow}{\csdef{@dtm@#1@dow}{-1}}{}%
  \ifcsundef{@dtm@#1@TZhour}{\csdef{@dtm@#1@TZhour}{0}}{}%
  \ifcsundef{@dtm@#1@TZminute}{\csdef{@dtm@#1@TZminute}{0}}{}%
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMsavetimezn}
% Save the time (including zone) specified in the format
% \meta{hh}:\meta{mm}:\meta{ss} \meta{tzh}:\meta{tzm}.
% \cs{expandafter} is used in case
% the argument is a control sequence storing the date. This will
% redefine an existing saved date with the same label. The first
% argument is the label.
%    \begin{macrocode}
\newrobustcmd*{\DTMsavetimezn}[2]{%
  \expandafter\@dtm@parsetimezn#2\@dtm@endparsetimezn
  \cslet{@dtm@#1@hour}{\@dtm@hour}%
  \cslet{@dtm@#1@minute}{\@dtm@minute}%
  \cslet{@dtm@#1@second}{\@dtm@second}%
  \cslet{@dtm@#1@TZhour}{\@dtm@timezonehour}%
  \cslet{@dtm@#1@TZminute}{\@dtm@timezoneminute}%
  \ifcsundef{@dtm@#1@year}{\csdef{@dtm@#1@year}{0}}{}%
  \ifcsundef{@dtm@#1@month}{\csdef{@dtm@#1@month}{0}}{}%
  \ifcsundef{@dtm@#1@day}{\csdef{@dtm@#1@day}{0}}{}%
  \ifcsundef{@dtm@#1@dow}{\csdef{@dtm@#1@dow}{-1}}{}%
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMsavetimestamp}
% Save the time (including zone) specified in the format
%\meta{YYYY}-\meta{MM}-\meta{DD}T\meta{hh}:\meta{mm}:\meta{ss}\meta{time
%zone}
%    \begin{macrocode}
\newrobustcmd*{\DTMsavetimestamp}[2]{%
  \expandafter\@dtm@parsetimestamp#2\@dtm@endparsetimestamp
  \cslet{@dtm@#1@year}{\@dtm@year}%
  \cslet{@dtm@#1@month}{\@dtm@month}%
  \cslet{@dtm@#1@day}{\@dtm@day}%
  \cslet{@dtm@#1@dow}{\@dtm@dow}%
  \cslet{@dtm@#1@hour}{\@dtm@hour}%
  \cslet{@dtm@#1@minute}{\@dtm@minute}%
  \cslet{@dtm@#1@second}{\@dtm@second}%
  \cslet{@dtm@#1@TZhour}{\@dtm@timezonehour}%
  \cslet{@dtm@#1@TZminute}{\@dtm@timezoneminute}%
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMsavenow}
%Save the current time.
%    \begin{macrocode}
\newrobustcmd{\DTMsavenow}[1]{%
  \cslet{@dtm@#1@year}{\@dtm@currentyear}%
  \cslet{@dtm@#1@month}{\@dtm@currentmonth}%
  \cslet{@dtm@#1@day}{\@dtm@currentday}%
  \cslet{@dtm@#1@dow}{\@dtm@currentdow}%
  \cslet{@dtm@#1@hour}{\@dtm@currenthour}%
  \cslet{@dtm@#1@minute}{\@dtm@currentminute}%
  \cslet{@dtm@#1@second}{\@dtm@currentsecond}%
  \cslet{@dtm@#1@TZhour}{\@dtm@currenttimezonehour}%
  \cslet{@dtm@#1@TZminute}{\@dtm@currenttimezoneminute}%
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMmakeglobal}
%Globally set the stored information.
%    \begin{macrocode}
\newrobustcmd{\DTMmakeglobal}[1]{%
  \global\csletcs{@dtm@#1@year}{@dtm@#1@year}%
  \global\csletcs{@dtm@#1@month}{@dtm@#1@month}%
  \global\csletcs{@dtm@#1@day}{@dtm@#1@day}%
  \global\csletcs{@dtm@#1@dow}{@dtm@#1@dow}%
  \global\csletcs{@dtm@#1@hour}{@dtm@#1@hour}%
  \global\csletcs{@dtm@#1@minute}{@dtm@#1@minute}%
  \global\csletcs{@dtm@#1@second}{@dtm@#1@second}%
  \global\csletcs{@dtm@#1@TZhour}{@dtm@#1@TZhour}%
  \global\csletcs{@dtm@#1@TZminute}{@dtm@#1@TZminute}%
}
%    \end{macrocode}
%\end{macro}
%
% Expandable ways of fetching saved data. (No check for existence
% performed.) The argument is the label.
%\begin{macro}{\DTMfetchyear}
%    \begin{macrocode}
\newcommand*{\DTMfetchyear}[1]{\csname @dtm@#1@year\endcsname}
%    \end{macrocode}
%\end{macro}
%\begin{macro}{\DTMfetchmonth}
%    \begin{macrocode}
\newcommand*{\DTMfetchmonth}[1]{\csname @dtm@#1@month\endcsname}
%    \end{macrocode}
%\end{macro}
%\begin{macro}{\DTMfetchday}
%    \begin{macrocode}
\newcommand*{\DTMfetchday}[1]{\csname @dtm@#1@day\endcsname}
%    \end{macrocode}
%\end{macro}
%\begin{macro}{\DTMfetchdow}
%    \begin{macrocode}
\newcommand*{\DTMfetchdow}[1]{\csname @dtm@#1@dow\endcsname}
%    \end{macrocode}
%\end{macro}
%\begin{macro}{\DTMfetchhour}
%    \begin{macrocode}
\newcommand*{\DTMfetchhour}[1]{\csname @dtm@#1@hour\endcsname}
%    \end{macrocode}
%\end{macro}
%\begin{macro}{\DTMfetchminute}
%    \begin{macrocode}
\newcommand*{\DTMfetchminute}[1]{\csname @dtm@#1@minute\endcsname}
%    \end{macrocode}
%\end{macro}
%\begin{macro}{\DTMfetchsecond}
%    \begin{macrocode}
\newcommand*{\DTMfetchsecond}[1]{\csname @dtm@#1@second\endcsname}
%    \end{macrocode}
%\end{macro}
%\begin{macro}{\DTMfetchTZhour}
%    \begin{macrocode}
\newcommand*{\DTMfetchTZhour}[1]{\csname @dtm@#1@TZhour\endcsname}
%    \end{macrocode}
%\end{macro}
%\begin{macro}{\DTMfetchTZminute}
%    \begin{macrocode}
\newcommand*{\DTMfetchTZminute}[1]{\csname @dtm@#1@TZminute\endcsname}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMusedate}
%\begin{definition}
%\cs{DTMusedate}\marg{label}
%\end{definition}
% Displays the previously saved date using \cs{DTMdisplaydate}.
%    \begin{macrocode}
\newcommand*\DTMusedate[1]{%
  \ifcsundef{@dtm@#1@year}%
  {%
     \PackageError{datetime2}{Undefined date `#1'}{}%
  }%
  {%
     \DTMdisplaydate
      {\csname @dtm@#1@year\endcsname}%
      {\csname @dtm@#1@month\endcsname}%
      {\csname @dtm@#1@day\endcsname}%
      {\csname @dtm@#1@dow\endcsname}%
  }%
}%
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMUsedate}
%\begin{definition}
%\cs{DTMUsedate}\marg{label}
%\end{definition}
% Displays the previously saved date using \cs{DTMDisplaydate}.
%    \begin{macrocode}
\newcommand*\DTMUsedate[1]{%
  \ifcsundef{@dtm@#1@year}%
  {%
     \PackageError{datetime2}{Undefined date `#1'}{}%
  }%
  {%
     \DTMDisplaydate
      {\csname @dtm@#1@year\endcsname}%
      {\csname @dtm@#1@month\endcsname}%
      {\csname @dtm@#1@day\endcsname}%
      {\csname @dtm@#1@dow\endcsname}%
  }%
}%
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMusetime}
%\begin{definition}
%\cs{DTMusetime}\marg{label}
%\end{definition}
% Displays the previously saved time using \cs{DTMdisplaytime}.
%    \begin{macrocode}
\newcommand*\DTMusetime[1]{%
  \ifcsundef{@dtm@#1@hour}%
  {%
     \PackageError{datetime2}{Undefined time `#1'}{}%
  }%
  {%
     \DTMdisplaytime
      {\csname @dtm@#1@hour\endcsname}%
      {\csname @dtm@#1@minute\endcsname}%
      {\csname @dtm@#1@second\endcsname}%
  }%
}%
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMusezone}
%\begin{definition}
%\cs{DTMusezone}\marg{label}
%\end{definition}
% Displays the previously saved date using \cs{DTMdisplayzone}.
%    \begin{macrocode}
\newcommand*\DTMusezone[1]{%
  \ifcsundef{@dtm@#1@TZhour}%
  {%
     \PackageError{datetime2}{Undefined time `#1'}{}%
  }%
  {%
     \DTMdisplayzone
      {\csname @dtm@#1@TZhour\endcsname}%
      {\csname @dtm@#1@TZminute\endcsname}%
  }%
}%
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMuse}
%\begin{definition}
%\cs{DTMuse}\marg{label}
%\end{definition}
% Displays the previously saved date and time.
%    \begin{macrocode}
\newcommand*\DTMuse[1]{%
  \ifcsundef{@dtm@#1@year}%
  {%
     \PackageError{datetime2}{Undefined date-time `#1'}{}%
  }%
  {%
     \DTMdisplay
      {\csname @dtm@#1@year\endcsname}%
      {\csname @dtm@#1@month\endcsname}%
      {\csname @dtm@#1@day\endcsname}%
      {\csname @dtm@#1@dow\endcsname}%
      {\csname @dtm@#1@hour\endcsname}%
      {\csname @dtm@#1@minute\endcsname}%
      {\csname @dtm@#1@second\endcsname}%
      {\csname @dtm@#1@TZhour\endcsname}%
      {\csname @dtm@#1@TZminute\endcsname}%
  }%
}%
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMUse}
%\begin{definition}
%\cs{DTMUse}\marg{label}
%\end{definition}
% Displays the previously saved date and time.
%    \begin{macrocode}
\newcommand*\DTMUse[1]{%
  \ifcsundef{@dtm@#1@year}%
  {%
     \PackageError{datetime2}{Undefined date-time `#1'}{}%
  }%
  {%
     \DTMDisplay
      {\csname @dtm@#1@year\endcsname}%
      {\csname @dtm@#1@month\endcsname}%
      {\csname @dtm@#1@day\endcsname}%
      {\csname @dtm@#1@dow\endcsname}%
      {\csname @dtm@#1@hour\endcsname}%
      {\csname @dtm@#1@minute\endcsname}%
      {\csname @dtm@#1@second\endcsname}%
      {\csname @dtm@#1@TZhour\endcsname}%
      {\csname @dtm@#1@TZminute\endcsname}%
  }%
}%
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMifsaveddate}
% Determine if the given label has been assigned to a date, time and
% zone.
%    \begin{macrocode}
\newcommand{\DTMifsaveddate}[3]{%
  \ifcsundef{@dtm@#1@year}{#3}{#2}%
}
%    \end{macrocode}
%\end{macro}
%
%\subsection{Language Module Loading}
%
% Define commands to load regional settings.
%
%\begin{macro}{\@dtm@requiremodule}
% Use \sty{tracklang} interface to find the associated file for the
% given dialect.
%    \begin{macrocode}
\newcommand*{\@dtm@requiremodule}[1]{%
  \IfTrackedLanguageFileExists{#1}%
  {datetime2-}% prefix
  {.ldf}% suffix
  {%
    \RequireDateTimeModule{\CurrentTrackedTag}%
  }%
  {%
    \@dtm@warning{Date-Time Language Module `#1' not installed}%
  }%
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\@dtm@loadedregions}
% List of loaded \styfmt{datetime2} language modules.
%    \begin{macrocode}
\newcommand*{\@dtm@loadedregions}{}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\RequireDateTimeModule}
% Input the language file, if not already loaded.
% Should only be used with \cs{@dtm@requiremodule}
% which sets commands like \cs{CurrentTrackedDialect}.
% Since the language modules are loaded within
% \cs{@dtm@requiremodule} they may use this command to load
% dependent modules.
%    \begin{macrocode}
\newcommand*{\RequireDateTimeModule}[1]{%
 \ifundef\CurrentTrackedDialect
 {%
   \PackageError{datetime2}%
   {\string\RequireDateTimeModule\space not permitted here}%
   {This command is only permitted inside datetime2 language
    modules.}%
 }%
 {%
   \ifcsundef{ver@datetime2-#1.ldf}%
   {%
     \input{datetime2-#1.ldf}%
     \ifdefempty\@dtm@loadedregions
     {%
       \edef\@dtm@loadedregions{#1}%
     }%
     {%
       \edef\@dtm@loadedregions{\@dtm@loadedregions,#1}%
     }%
   }%
   {}%
 }%
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\ProvidesDateTimeModule}
% For use in language module to identify itself.
%    \begin{macrocode}
\newcommand*{\ProvidesDateTimeModule}[1]{%
  \ProvidesFile{datetime2-#1.ldf}%
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMdefkey}
%\begin{definition}
%\cs{DTMdefkey}\marg{region}\marg{key}\oarg{default}\marg{func}
%\end{definition}
% Used by language modules to define a key.
%    \begin{macrocode}
\newcommand*{\DTMdefkey}[1]{\define@key[dtm]{#1}}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMdefchoicekey}
%\begin{definition}
%\cs{DTMdefchoicekey}\marg{region}\marg{key}\oarg{bin}\marg{choice
%list}\marg{default}\marg{func}
%\end{definition}
% Used by language modules to define a choice key.
%    \begin{macrocode}
\newcommand*{\DTMdefchoicekey}[1]{\define@choicekey[dtm]{#1}}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMdefboolkey}
%\begin{definition}
%\cs{DTMdefboolkey}\marg{region}\oarg{mp}\marg{key}\oarg{default}\marg{func}
%\end{definition}
% Used by language modules to define a boolean key.
%    \begin{macrocode}
\newcommand*{\DTMdefboolkey}[1]{\define@boolkey[dtm]{#1}}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMifbool}
%\begin{definition}
%\cs{DTMifbool}\marg{region}\marg{key}\marg{true}\marg{false}
%\end{definition}
% Test boolean key that was defined using \cs{DTMdefboolkey}
%    \begin{macrocode}
\newcommand*{\DTMifbool}[4]{\ifbool{dtm@#1@#2}{#3}{#4}}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMsetbool}
%\begin{definition}
%\cs{DTMsetbool}\marg{region}\marg{key}\marg{value}
%\end{definition}
% Set boolean key that was defined using \cs{DTMdefboolkey}
%    \begin{macrocode}
\newcommand*{\DTMsetbool}[3]{\setbool{dtm@#1@#2}{#3}}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMlangsetup}
% Set up options for language modules. The optional argument is a
% list of language/regions. If omitted all loaded regions are
% iterated over. (I'm not sure why \cs{setkeys} doesn't work
% if the same key is present in multiple families, so this iterates
% over the families instead.)
%    \begin{macrocode}
\newcommand*{\DTMlangsetup}[2][\@dtm@loadedregions]{%
 \@for\@dtm@region:=#1\do{%
   \setkeys*+[dtm]{\@dtm@region}{#2}%
   \ifdefempty\XKV@rm{}%
   {%
     \@dtm@warning{Region `\@dtm@region' has ignored
      \MessageBreak the following settings:\MessageBreak
      \XKV@rm
      ^^J}%
   }%
 }%
}
%    \end{macrocode}
%\end{macro}
%
% Now load all the required modules (if installed) using the
% \sty{tracklang} interface. (Language packages, such as \sty{babel}
% or \sty{polyglossia} must be loaded before this.)
%    \begin{macrocode}
\AnyTrackedLanguages
{%
  \ForEachTrackedDialect{\this@dialect}%
  {%
    \@dtm@requiremodule\this@dialect
  }%
}
{%
%    \end{macrocode}
% No tracked languages. The default is already set up, so nothing to
% do here.
%    \begin{macrocode}
}
%    \end{macrocode}
%
% Load \sty{datetime2-calc} if required.
%    \begin{macrocode}
\@dtm@usecalc
%    \end{macrocode}
%
% Use the \pkgopt{style} package option, if set.
%    \begin{macrocode}
\ifdefempty\@dtm@initialstyle{}{\DTMsetstyle{\@dtm@initialstyle}}
%    \end{macrocode}
%\iffalse
%    \begin{macrocode}
%</datetime2.sty>
%    \end{macrocode}
%\fi
%\iffalse
%    \begin{macrocode}
%<*datetime2-calc.sty>
%    \end{macrocode}
%\fi
%\section{datetime2-calc.sty code}
%    \begin{macrocode}
\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{datetime2-calc}[2015/09/15 v1.1 (NLCT)]
%    \end{macrocode}
% Load other required packages
%    \begin{macrocode}
\RequirePackage{pgfkeys}
\RequirePackage{pgfcalendar}
%    \end{macrocode}
%
%\begin{macro}{\@dtm@julianday}
% Register for storing Julian day number.
%    \begin{macrocode}
\newcount\@dtm@julianday
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\@dtm@parsedate}
% Redefine \cs{@dtm@parsedate} so that it uses \sty{pgfcalendar} to
% compute the required information. This allows for offsets, the use
% of \texttt{last} and also determine the day of week.
%    \begin{macrocode}
\def\@dtm@parsedate#1-#2-#3\@dtm@endparsedate{%
  \pgfcalendardatetojulian{#1-#2-#3}{\@dtm@julianday}%
  \pgfcalendarjuliantodate{\@dtm@julianday}{\@dtm@year}{\@dtm@month}{\@dtm@day}%
  \pgfcalendarjuliantoweekday{\@dtm@julianday}{\count@}%
  \edef\@dtm@dow{\number\count@}%
}
%    \end{macrocode}
%\end{macro}
%
% Set the current day of week
%\begin{macro}{\@dtm@currentdow}
%    \begin{macrocode}
\pgfcalendardatetojulian
 {\@dtm@currentyear-\@dtm@currentmonth-\@dtm@currentday}%
 {\@dtm@julianday}%
\pgfcalendarjuliantoweekday{\@dtm@julianday}{\count@}%
\edef\@dtm@currentdow{\number\count@}%
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMsavejulianday}
% Save the date obtained from the Julian day number.
%    \begin{macrocode}
\newrobustcmd*{\DTMsavejulianday}[2]{%
  \pgfcalendarjuliantodate{#2}{\@dtm@year}{\@dtm@month}{\@dtm@day}%
  \pgfcalendarjuliantoweekday{#2}{\count@}%
  \csedef{@dtm@#1@dow}{\number\count@}%
  \cslet{@dtm@#1@year}{\@dtm@year}%
  \cslet{@dtm@#1@month}{\@dtm@month}%
  \cslet{@dtm@#1@day}{\@dtm@day}%
  \ifcsundef{@dtm@#1@hour}{\csdef{@dtm@#1@hour}{0}}{}%
  \ifcsundef{@dtm@#1@minute}{\csdef{@dtm@#1@minute}{0}}{}%
  \ifcsundef{@dtm@#1@second}{\csdef{@dtm@#1@second}{0}}{}%
  \ifcsundef{@dtm@#1@TZhour}{\csdef{@dtm@#1@TZhour}{0}}{}%
  \ifcsundef{@dtm@#1@TZminute}{\csdef{@dtm@#1@TZminute}{0}}{}%
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMsaveddatetojulianday}
% Converts a saved date to a Julian day number. The first argument
% is the name referencing the saved date, the second is a count
% register in which to store the result.
%    \begin{macrocode}
\newrobustcmd*{\DTMsaveddatetojulianday}[2]{%
  \ifcsundef{@dtm@#1@year}%
  {%
     \PackageError{datetime2-calc}{Unknown date `#1'}{}%
  }%
  {%
    \pgfcalendardatetojulian
     {\csname @dtm@#1@year\endcsname
     -\csname @dtm@#1@month\endcsname
     -\csname @dtm@#1@day\endcsname}
     {#2}%
  }%
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMsaveddateoffsettojulianday}
% Converts an offset from the saved date to a Julian day number.
% The first argument is the name referencing the saved date,
% the second is the offset increment and the third is a count register
% in which to store the result.
%    \begin{macrocode}
\newrobustcmd*{\DTMsaveddateoffsettojulianday}[3]{%
  \ifcsundef{@dtm@#1@year}%
  {%
     \PackageError{datetime2-calc}{Unknown date `#1'}{}%
  }%
  {%
    \pgfcalendardatetojulian
     {\csname @dtm@#1@year\endcsname
     -\csname @dtm@#1@month\endcsname
     -\csname @dtm@#1@day\endcsname
     +#2}
     {#3}%
  }%
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMifdate}
% Test a saved date using \cs{pgfcalendarifdate}
%    \begin{macrocode}
\newrobustcmd*{\DTMifdate}[4]{%
  \ifcsundef{@dtm@#1@year}%
  {%
     \PackageError{datetime2-calc}{Unknown date `#1'}{}%
  }%
  {%
    \pgfcalendarifdate
     {\csname @dtm@#1@year\endcsname
     -\csname @dtm@#1@month\endcsname
     -\csname @dtm@#1@day\endcsname}
     {#2}{#3}{#4}%
  }%
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMsaveddatediff}
% Computes the difference between two saved dates. The result is
% stored in the third argument, which should be a count register.
%    \begin{macrocode}
\newrobustcmd*{\DTMsaveddatediff}[3]{%
  \ifcsundef{@dtm@#1@year}%
  {%
     \PackageError{datetime2-calc}{Unknown date `#1'}{}%
  }%
  {%
     \ifcsundef{@dtm@#2@year}%
     {%
        \PackageError{datetime2-calc}{Unknown date `#1'}{}%
     }%
     {%
       \pgfcalendardatetojulian
        {\csname @dtm@#1@year\endcsname
        -\csname @dtm@#1@month\endcsname
        -\csname @dtm@#1@day\endcsname}
        {#3}%
       \pgfcalendardatetojulian
        {\csname @dtm@#2@year\endcsname
        -\csname @dtm@#2@month\endcsname
        -\csname @dtm@#2@day\endcsname}
        {\@dtm@julianday}%
       \advance#3 by -\@dtm@julianday\relax
    }
  }%
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMtozulu}
% Converts the datetime data referenced by the first argument into
% Zulu time and saves it to data referenced by the second argument.
%    \begin{macrocode}
\newrobustcmd*{\DTMtozulu}[2]{%
  \ifcsundef{@dtm@#1@year}%
  {%
     \PackageError{datetime2-calc}{Unknown date `#1'}{}%
  }%
  {%
    \DTMsaveaszulutime{#2}%
    {\DTMfetchyear{#1}}%
    {\DTMfetchmonth{#1}}%
    {\DTMfetchday{#1}}%
    {\DTMfetchhour{#1}}%
    {\DTMfetchminute{#1}}%
    {\DTMfetchsecond{#1}}%
    {\DTMfetchTZhour{#1}}%
    {\DTMfetchTZminute{#1}}%
  }%
}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\DTMsaveaszulutime}
% Converts the given datetime into Zulu (+00:00) and saves
% the result.
%\changes{1.1}{2015-09-15}{fixed bug in incorrect conversion}
%\begin{definition}
%\cs{DTMsavetozulutime}\marg{name}\marg{year}\marg{month}\marg{day}\marg{hour}\newline\marg{minute}\marg{second}\marg{tzh}\marg{tzm}
%\end{definition}
%    \begin{macrocode}
\newrobustcmd*{\DTMsaveaszulutime}[9]{%
  \edef\@dtm@year{\number#2}%
  \edef\@dtm@month{\number#3}%
  \edef\@dtm@day{\number#4}%
  \edef\@dtm@hour{\number#5}%
  \edef\@dtm@minute{\number#6}%
  \edef\@dtm@second{\number#7}%
  \edef\@dtm@TZhour{\number#8}%
  \edef\@dtm@TZminute{\number#9}%
  \pgfcalendardatetojulian{\@dtm@year-\@dtm@month-\@dtm@day}{\@dtm@julianday}%
%    \end{macrocode}
% First adjust the minute offset if non-zero
%    \begin{macrocode}
  \ifnum\@dtm@TZminute=0\relax
  \else
    \count@=\@dtm@minute\relax
%    \end{macrocode}
% Add or subtract the offset minute
%    \begin{macrocode}
    \ifnum\@dtm@TZhour<0\relax
      \advance\count@ by \@dtm@TZminute\relax
    \else
      \advance\count@ by -\@dtm@TZminute\relax
    \fi
    \edef\@dtm@minute{\number\count@}%
%    \end{macrocode}
% Does the hour need adjusting?
%    \begin{macrocode}
    \ifnum\count@<0\relax
      \advance\count@ by 60\relax
      \edef\@dtm@minute{\number\count@}%
%    \end{macrocode}
% Need to subtract 1 from the hour
% but does the day need adjusting?
%    \begin{macrocode}
      \ifnum\@dtm@hour=0\relax
       \def\@dtm@hour{23}%
%    \end{macrocode}
% Day needs adjusting.
%    \begin{macrocode}
       \advance\@dtm@julianday by -1\relax
      \else
%    \end{macrocode}
% Subtract 1 from the hour
%    \begin{macrocode}
        \count@ = \@dtm@hour\relax
        \advance\count@ by -1\relax
        \edef\@dtm@hour{\number\count@}%
      \fi
    \else
%    \end{macrocode}
% Minute isn't negative. Is it $\ge 60$?
%    \begin{macrocode}
      \ifnum\count@>59\relax
        \advance\count@ by -60\relax
        \edef\@dtm@minute{\number\count@}%
%    \end{macrocode}
% Add 1 to the hour
%    \begin{macrocode}
        \count@ = \@dtm@hour\relax
        \advance\count@ by 1\relax
        \edef\@dtm@hour{\number\count@}%
%    \end{macrocode}
% Does the day need adjusting?
%\changes{1.1}{2015-09-15}{fixed bug in misnamed \cs{@dtm@hour}}
%    \begin{macrocode}
        \ifnum\@dtm@hour=24\relax
          \def\@dtm@hour{00}%
          \advance\@dtm@julianday by 1\relax
        \fi
      \fi
    \fi
  \fi
%    \end{macrocode}
% Now adjust the hour offset if non-zero
%    \begin{macrocode}
  \ifnum\@dtm@TZhour=0\relax
  \else
    \count@=\@dtm@hour\relax
    \advance\count@ by -\@dtm@TZhour\relax
%    \end{macrocode}
% Does the day need adjusting?
%    \begin{macrocode}
    \ifnum\count@<0\relax
      \advance\count@ by 24\relax
      \edef\@dtm@hour{\number\count@}%
      \advance\@dtm@julianday by -1\relax
    \else
      \ifnum\count@>23\relax
      \advance\count@ by -24\relax
      \edef\@dtm@hour{\number\count@}%
      \advance\@dtm@julianday by 1\relax
      \else
        \edef\@dtm@hour{\number\count@}%
      \fi
    \fi
  \fi
  \pgfcalendarjuliantodate{\@dtm@julianday}{\@dtm@year}{\@dtm@month}{\@dtm@day}%
  \pgfcalendarjuliantoweekday{\@dtm@julianday}{\count@}%
%    \end{macrocode}
% Save the results.
%    \begin{macrocode}
  \csedef{@dtm@#1@dow}{\number\count@}%
  \cslet{@dtm@#1@year}{\@dtm@year}%
  \cslet{@dtm@#1@month}{\@dtm@month}%
  \cslet{@dtm@#1@day}{\@dtm@day}%
  \cslet{@dtm@#1@hour}{\@dtm@hour}%
  \cslet{@dtm@#1@minute}{\@dtm@minute}%
  \cslet{@dtm@#1@second}{\@dtm@second}%
  \csdef{@dtm@#1@TZhour}{0}%
  \csdef{@dtm@#1@TZminute}{0}%
}
%    \end{macrocode}
%\end{macro}
%\iffalse
%    \begin{macrocode}
%</datetime2-calc.sty>
%    \end{macrocode}
%\fi
%\Finale
\endinput