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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 26.18, p. III-384.
+% Original source in file "macros6.TEX", starting line 1256.
+\wlog{L: "mondofda.tip" ["macros6.TEX," l. 1256, p. III-384]}%
+% This file DOES belong to format "texip."
+\InputD{arbday.tip}
+\InputD{prevday.tip}
+\InputD{doloop.tip}
+\catcode`\@ = 11
+\newcount\@ComputeMondayOfDateDay
+\newcount\@ComputeMondayOfDateDayTwo
+\def\ComputeMondayOfDate #1#2#3#4#5#6{%
+ #4 = #1\relax
+ #5 = #2\relax
+ #6 = #3\relax
+ \ArbitraryDayOfWeek{#4}{#5}{#6}{\@ComputeMondayOfDateDay}%
+ \ifnum\@ComputeMondayOfDateDay = \Sunday
+ \@ComputeMondayOfDateDay = 6
+ \else
+ \advance\@ComputeMondayOfDateDay by -1
+ \fi
+ \DoLoop{\@ComputeMondayOfDateDayTwo}
+ {\@ComputeMondayOfDateDay}{-1}{1}%
+ {\PrevDay{#4}{#5}{#6}{#4}{#5}{#6}}%
+}
+\catcode`\@ = 12