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69 lines
1.9 KiB
69 lines
1.9 KiB
%%%%%%%%%%%%% cal-util.def %%%%%%%%%%%%%%%%
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% Macros shared by hijrical and hebrewcal %
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% the following is adapted from hebcal.sty in babel
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\def\@Remainder#1#2#3{%
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#3 = #1% % c = a
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\divide #3 by #2% % c = a/b
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\multiply #3 by -#2% % c = -b(a/b)
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\advance #3 by #1}% % c = a - b(a/b)
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\newif\if@Divisible
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\def\@CheckIfDivisible#1#2{%
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{%
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\countdef\tmpx=0% % temporary variable
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\@Remainder{#1}{#2}{\tmpx}%
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\ifnum\tmpx=0%
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\global\@Divisibletrue%
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\else%
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\global\@Divisiblefalse%
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\fi}}
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\newif\if@GregorianLeap
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\def\@CheckIfGregorianLeap#1{%
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{%
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\@CheckIfDivisible{#1}{4}%
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\if@Divisible%
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\@CheckIfDivisible{#1}{100}%
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\if@Divisible%
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\@CheckIfDivisible{#1}{400}%
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\if@Divisible%
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\global\@GregorianLeaptrue%
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\else%
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\global\@GregorianLeapfalse%
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\fi%
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\else%
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\global\@GregorianLeaptrue%
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\fi%
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\else%
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\global\@GregorianLeapfalse%
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\fi%
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}}
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%%
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\newcounter{tmpA}\newcounter{tmpB}
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\newcounter{tmpC}\newcounter{tmpD}
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\newcounter{tmpE}\newcounter{tmpF}
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%% This is an algorithm from Reingold & Dershowitz,
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%% Calendrical Calculations, The Millenium Edition
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%%
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\def\@FixedFromGregorian#1#2#3#4{%
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\setcounter{tmpA}{(#1-1)*365}%
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\setcounter{tmpB}{(#1-1)/4}%
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\setcounter{tmpC}{(#1-1)/100}%
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\setcounter{tmpD}{(#1-1)/400}%
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\setcounter{tmpE}{(367*#2-362)/12}%
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\ifnum#2<3%
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\setcounter{tmpF}{0}%
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\else%
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\@CheckIfGregorianLeap{#1}%
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\if@GregorianLeap%
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\setcounter{tmpF}{-1}%
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\else%
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\setcounter{tmpF}{-2}%
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\fi%
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\fi%
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\@ifundefined{c@#4}{\global\newcounter{#4}}{}%
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\setcounter{#4}{\value{tmpA}+\value{tmpB}-\value{tmpC}+\value{tmpD}+\value{tmpE}+\value{tmpF}+#3}%
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}
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\endinput
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