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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 26.1, p. III-357.
+% Original source in file "macros6.TEX", starting line 39.
+\wlog{L: "earliest.tip" ["macros6.TEX," l. 39, p. III-357]}%
+% This file DOES belong to format "texip."
+\InputD{dateofw.tip}
+\InputD{arbday.tip}
+\catcode`\@ = 11
+\newcount\@TempEarliest
+\newcount\EarliestYearDate
+\EarliestYearDate = 1583
+\newcount\DayOfWeekOfEarliestDate
+\DayOfWeekOfEarliestDate = \Saturday
+\def\VerifyInitDate{%
+ {%
+ \ArbitraryDayOfWeek{2000}{1}{1}{\@TempEarliest}%
+ \ifnum\@TempEarliest = \Saturday
+ \message{\string\VerifyInitDate: initialization
+ correct (initialization year:
+ \the\EarliestYearDate).}%
+ \else
+ \errmessage{\string\VerifyInitDate: January 1 of 2000
+ is a Saturday! Computation reports it is
+ day \the\@TempEarliest\space. Initialization error.}%
+ \fi
+ }%
+}
+\catcode`\@ = 12