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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 26.12, p. III-374.
% Original source in file "macros6.TEX", starting line 773.
\wlog{L: "prevday.tip" ["macros6.TEX," l. 773, p. III-374]}%
% This file DOES belong to format "texip."
\InputD{legdate.tip}
\InputD{ndaysmo.tip}
\InputD{copydate.tip}
\catcode`\@ = 11
\newcount\@TempPrevDay
\def\PrevDay #1#2#3#4#5#6{%
\CheckDate{#1}{#2}{#3}%
\CopyDate{#1}{#2}{#3}{#4}{#5}{#6}%
\advance #6 by -1
\ifnum #6 = 0
\advance #5 by -1
\ifnum #5 = 0
#5 = 12
\advance #4 by -1
\fi
\NumberOfDaysInMonth{#4}{#5}{#6}%
\fi
}
\catcode`\@ = 12
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