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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 26.8, p. III-367.
+% Original source in file "macros6.TEX", starting line 495.
+\wlog{L: "legdate.tip" ["macros6.TEX," l. 495, p. III-367]}%
+% This file DOES belong to format "texip."
+\InputD{legmonth.tip}
+\InputD{legyear.tip}
+\InputD{rangetst.tip}
+\InputD{ndaysmo.tip}
+\catcode`\@ = 11
+\newcount\@TempCheckDate
+\def\CheckDate #1#2#3{%
+ \CheckLegalYear{#1}%
+ \CheckLegalMonth{#2}%
+ \NumberOfDaysInMonth{#1}{#2}{\@TempCheckDate}%
+ \CheckRange{#3}{1}{\@TempCheckDate}%
+ {\string\CheckDate: provided date #1-#2-#3 is illegal.}%
+}
+\catcode`\@ = 12