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+% This macro source file is from the four volume series
+% "TeX in Practice" by Stephan von Bechtolsheim, published
+% 1993 by Springer-Verlag, New York.
+% Copyright 1993 Stephan von Bechtolsheim.
+% No warranty or liability is assumed.
+% This macro may be copied freely if no fees other than
+% media cost or shipping charges are charged and as long
+% as this copyright and the following source code itself
+% is not changed. Please see the series for further information.
+%
+% Version: 1.0
+% Date: May 1, 1993
+%
+%
+% This source code is documented in 26.11, p. III-372.
+% Original source in file "macros6.TEX", starting line 676.
+\wlog{L: "nextday.tip" ["macros6.TEX," l. 676, p. III-372]}%
+% This file DOES belong to format "texip."
+\InputD{legdate.tip}
+\InputD{ndaysmo.tip}
+\InputD{copydate.tip}
+\catcode`\@ = 11
+\newcount\@TempNextDay
+\def\NextDay #1#2#3#4#5#6{%
+ \CheckDate{#1}{#2}{#3}%
+ \CopyDate{#1}{#2}{#3}{#4}{#5}{#6}%
+ \advance #6 by 1
+ \NumberOfDaysInMonth{#1}{#2}{\@TempNextDay}%
+ \ifnum #6 > \@TempNextDay
+ #6 = 1
+ \advance #5 by 1
+ \ifnum #5 = 13
+ #5 = 1
+ \advance #4 by 1
+ \fi
+ \fi
+}
+\catcode`\@ = 12