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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 26.16, p. III-381.
+% Original source in file "macros6.TEX", starting line 1098.
+\wlog{L: "arbday.tip" ["macros6.TEX," l. 1098, p. III-381]}%
+% This file DOES belong to format "texip."
+\InputD{legdate.tip}
+\InputD{dateofw.tip}
+\InputD{imodn.tip}
+\InputD{nextday.tip}
+\InputD{numdyr.tip}
+\InputD{prmonth.tip}
+\InputD{earliest.tip}
+\InputD{doloop.tip}
+\catcode`\@ = 11
+\newcount\@YearTemp
+\newcount\@YearTop
+\newcount\@MonthTemp
+\newcount\@MonthTop
+\newcount\@TempAD
+\def\ArbitraryDayOfWeek #1#2#3#4{%
+ \CheckDate{#1}{#2}{#3}%
+ #4 = \DayOfWeekOfEarliestDate
+ \@YearTop = #1\relax
+ \advance\@YearTop by -1
+ \DoLoop{\@YearTemp}{\EarliestYearDate}{1}{\@YearTop}{%
+ \NumberOfDaysInYear{\@YearTemp}{\@TempAD}%
+ \advance #4 by \@TempAD
+ }%
+ \IModN{#4}{7}{#4}%
+ \@MonthTop = #2\relax
+ \advance\@MonthTop by -1
+ \DoLoop{\@MonthTemp}{1}{1}{\@MonthTop}{%
+ \NumberOfDaysInMonth{#1}{\@MonthTemp}{\@TempAD}%
+ \advance #4 by \@TempAD
+ }%
+ \IModN{#4}{7}{#4}%
+ \advance #4 by #3\relax
+ \advance #4 by -1
+ \IModN{#4}{7}{#4}%
+}
+\catcode`\@ = 12