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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 26.7, p. III-366.
+% Original source in file "macros6.TEX", starting line 401.
+\wlog{L: "ndaysmo.tip" ["macros6.TEX," l. 401, p. III-366]}%
+% This file DOES belong to format "texip."
+\InputD{legyear.tip}
+\InputD{legmonth.tip}
+\InputD{isleapyr.tip}
+\def\NumberOfDaysInMonth #1#2#3{%
+ \CheckLegalYear{#1}%
+ \CheckLegalMonth{#2}%
+ \ifcase #2\relax
+ \or
+ #3 = 31
+ \or
+ #3 = 28
+ \if\LeapYearConditional{#1}%
+ #3 = 29
+ \fi
+ \or
+ #3 = 31
+ \or
+ #3 = 30
+ \or
+ #3 = 31
+ \or
+ #3 = 30
+ \or
+ #3 = 31
+ \or
+ #3 = 31
+ \or
+ #3 = 30
+ \or
+ #3 = 31
+ \or
+ #3 = 30
+ \or
+ #3 = 31
+ \fi
+}