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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 26.9, p. III-370.
+% Original source in file "macros6.TEX", starting line 541.
+\wlog{L: "isleapyr.tip" ["macros6.TEX," l. 541, p. III-370]}%
+% This file DOES belong to format "texip."
+\InputD{imodn.tip}
+\catcode`\@ = 11
+\newif\if@LeapYear
+\def\LeapYearConditional #1{%
+ TT\fi
+ {%
+ \count0 = #1\relax
+ \IModN{\count0}{4}{\count1}%
+ \ifnum\count1 = 0
+ \global\@LeapYeartrue
+ \IModN{\count0}{100}{\count2}%
+ \IModN{\count0}{400}{\count3}%
+ \ifnum\count2 = 0
+ \global\@LeapYearfalse
+ \fi
+ \ifnum\count3 = 0
+ \global\@LeapYeartrue
+ \fi
+ \else
+ \global\@LeapYearfalse
+ \fi
+ }%
+ \if@LeapYear
+}
+\catcode`\@ = 12