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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 26.11, p. III-372.
% Original source in file "macros6.TEX", starting line 676.
\wlog{L: "nextday.tip" ["macros6.TEX," l. 676, p. III-372]}%
% This file DOES belong to format "texip."
\InputD{legdate.tip}
\InputD{ndaysmo.tip}
\InputD{copydate.tip}
\catcode`\@ = 11
\newcount\@TempNextDay
\def\NextDay #1#2#3#4#5#6{%
    \CheckDate{#1}{#2}{#3}%
    \CopyDate{#1}{#2}{#3}{#4}{#5}{#6}%
    \advance #6 by 1
    \NumberOfDaysInMonth{#1}{#2}{\@TempNextDay}%
    \ifnum #6 > \@TempNextDay
        #6 = 1
        \advance #5 by 1
        \ifnum #5 = 13
            #5 = 1
            \advance #4 by 1
        \fi
    \fi
}
\catcode`\@ = 12