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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 26.14, p. III-378.
+% Original source in file "macros6.TEX", starting line 958.
+\wlog{L: "nextmon.tip" ["macros6.TEX," l. 958, p. III-378]}%
+% This file DOES belong to format "texip."
+\InputD{legdate.tip}
+\catcode`\@ = 11
+\def\NextMonth #1#2#3#4{%
+ \CheckDate{#1}{#2}{1}%
+ #3 = #1\relax
+ #4 = #2\relax
+ \advance #4 by 1
+ \ifnum #4 = 13
+ #4 = 1
+ \advance #3 by 1
+ \fi
+}
+\catcode`\@ = 12