% 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