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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: 1.1
+% Date: Sep 9, 1993
+%
+%
+% This source code is documented in 26.22, p. III-392.
+% Original source in file "macros6.TEX", starting line 1641.
+\wlog{L: "weekofyr.tip" ["macros6.TEX," l. 1641, p. III-392]}%
+% This file DOES belong to format "texip."
+\InputD{doloop.tip}
+\InputD{dateofw.tip}
+\InputD{arbday.tip}
+\InputD{prevday.tip}
+\InputD{mondofda.tip}
+\InputD{norpweek.tip}
+\catcode`\@ = 11
+\newcount\@WeekOfYearCounter
+\newcount\@WeekOfYearYear
+\newcount\@WeekOfYearMonth
+\newcount\@WeekOfYearDay
+\newcount\@WeekOfYearCopy
+\def\WeekOfYear #1#2#3#4{%
+ \@WeekOfYearCopy = #1\relax
+ \ComputeMondayOfDate{#1}{#2}{#3}%
+ {\@WeekOfYearYear}{\@WeekOfYearMonth}{\@WeekOfYearDay}%
+ \def\@WeekOfYearCounter{#4}%
+ \@WeekOfYearCounter = 1
+ \@WeekOfYear
+}
+\newif\if@YearStop
+\def\@WeekOfYear{%
+ \@YearStopfalse
+ \ifnum\@WeekOfYearCopy > \@WeekOfYearYear
+ \@YearStoptrue
+ \else
+ \ifnum\@WeekOfYearMonth = 1
+ \ifnum\@WeekOfYearDay = 1
+ \@YearStoptrue
+ \fi
+ \fi
+ \fi
+ \if@YearStop
+ \def\@WeekOfYearNext{\relax}%
+ \else
+ \def\@WeekOfYearNext{\@WeekOfYear}%
+ \expandafter\advance\@WeekOfYearCounter by 1
+ \PrevWeekSameDay{\@WeekOfYearYear}{\@WeekOfYearMonth}%
+ {\@WeekOfYearDay}%
+ {\@WeekOfYearYear}{\@WeekOfYearMonth}%
+ {\@WeekOfYearDay}%
+ \fi
+ \@WeekOfYearNext
+}
+\catcode`\@ = 12