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\ProvidesPackage{farsical}
        [2008/07/02 v0.1 %
         Farsi (jalali) calendar]
\RequirePackage{bidi,calc,arabicnumbers}

%TODO - rewrite completely using calc 
%%    - use Reingold & Dershowitz ME
%% 
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%% Modified from Arabiftoday.sty which is part of the Arabi package:
%%%  Copyright (C) 2006 Youssef Jabri
%%% itself a modification of the code in the FarsiTeX system:
%%%  Copyright (C) 1996 Hassan Abolhassani
%%%  Copyright (C) 1996-2001 Roozbeh Pournader <roozbeh@sharif.edu>
%%%  Copyright (C) 2000-2001 Behdad Esfahbod <behdad@bamdad.org>
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\newif\ifJALALI@leap \newif\ifJALALI@kabiseh
\newcount\JALALI@i  \newcount\JALALI@y  \newcount\JALALI@m  \newcount\JALALI@d
\newcount\JALALI@latini    \newcount\JALALI@farsii
\newcount\JALALI@latinii   \newcount\JALALI@farsiii
\newcount\JALALI@latiniii  \newcount\JALALI@farsiiii
\newcount\JALALI@latiniv   \newcount\JALALI@farsiiv
\newcount\JALALI@latinv    \newcount\JALALI@farsiv
\newcount\JALALI@latinvi   \newcount\JALALI@farsivi
\newcount\JALALI@latinvii  \newcount\JALALI@farsivii
\newcount\JALALI@latinviii \newcount\JALALI@farsiviii
\newcount\JALALI@latinix   \newcount\JALALI@farsiix
\newcount\JALALI@latinx    \newcount\JALALI@farsix
\newcount\JALALI@latinxi   \newcount\JALALI@farsixi
\newcount\JALALI@latinxii  \newcount\JALALI@farsixii
                           \newcount\JALALI@farsixiii

\newcount\JALALI@temp
\newcount\JALALI@temptwo
\newcount\JALALI@tempthree
\newcount\JALALI@yModHundred
\newcount\JALALI@thirtytwo
\newcount\JALALI@dn
\newcount\JALALI@sn
\newcount\JALALI@mminusone

% \ftoday renamed to \Jalalitoday - FC
\def\Jalalitoday{%
\JALALI@y=\year \JALALI@m=\month \JALALI@d=\day
%
\JALALI@temp=\JALALI@y
\divide\JALALI@temp by 100\relax
\multiply\JALALI@temp by 100\relax
\JALALI@yModHundred=\JALALI@y
\advance\JALALI@yModHundred by -\JALALI@temp\relax
%
\ifodd\JALALI@yModHundred
   \JALALI@leapfalse
\else
   \JALALI@temp=\JALALI@yModHundred
   \divide\JALALI@temp by 2\relax
   \ifodd\JALALI@temp\JALALI@leapfalse
   \else
      \ifnum\JALALI@yModHundred=0%
         \JALALI@temp=\JALALI@y
         \divide\JALALI@temp by 400\relax
         \multiply\JALALI@temp by 400\relax
         \ifnum\JALALI@y=\JALALI@temp\JALALI@leaptrue\else\JALALI@leapfalse\fi
      \else\JALALI@leaptrue
      \fi
   \fi
\fi
%
\JALALI@latini=31\relax
\ifJALALI@leap
  \JALALI@latinii = 29\relax
\else
  \JALALI@latinii = 28\relax
\fi
\JALALI@latiniii = 31\relax
\JALALI@latiniv  = 30\relax
\JALALI@latinv = 31\relax
\JALALI@latinvi = 30\relax
\JALALI@latinvii = 31\relax
\JALALI@latinviii = 31\relax
\JALALI@latinix = 30\relax
\JALALI@latinx = 31\relax
\JALALI@latinxi = 30\relax
\JALALI@latinxii = 31\relax
%
\JALALI@thirtytwo=32\relax
%
\JALALI@temp=\JALALI@y
\advance\JALALI@temp by -17\relax
\JALALI@temptwo=\JALALI@temp
\divide\JALALI@temptwo by 33\relax
\multiply\JALALI@temptwo by 33\relax
\advance\JALALI@temp by -\JALALI@temptwo
\ifnum\JALALI@temp=\JALALI@thirtytwo\JALALI@kabisehfalse
\else
   \JALALI@temptwo=\JALALI@temp
   \divide\JALALI@temptwo by 4\relax
   \multiply\JALALI@temptwo by 4\relax
   \advance\JALALI@temp by -\JALALI@temptwo
   \ifnum\JALALI@temp=\z@\JALALI@kabisehtrue\else\JALALI@kabisehfalse\fi
\fi
%
% --BE
% In fact farsii is equal to the Leap years from a fixed year to the last
% year minus the Kabise years from a fixed year to the last year plus a const.
%
\JALALI@tempthree=\JALALI@y                 % Number of Leap years
\advance\JALALI@tempthree by -1
\JALALI@temp=\JALALI@tempthree              % T := (MY-1) div 4
\divide\JALALI@temp by 4\relax
\JALALI@temptwo=\JALALI@tempthree           % T := T - ((MY-1) div 100)
\divide\JALALI@temptwo by 100\relax
\advance\JALALI@temp by -\JALALI@temptwo
\JALALI@temptwo=\JALALI@tempthree           % T := T + ((MY-1) div 400)
\divide\JALALI@temptwo by 400\relax
\advance\JALALI@temp by \JALALI@temptwo
\advance\JALALI@tempthree by -611       % Number of Kabise years
\JALALI@temptwo=\JALALI@tempthree           % T := T - ((SY+10) div 33) * 8
\divide\JALALI@temptwo by 33\relax
\multiply\JALALI@temptwo by 8\relax
\advance\JALALI@temp by -\JALALI@temptwo
\JALALI@temptwo=\JALALI@tempthree           %
\divide\JALALI@temptwo by 33\relax
\multiply\JALALI@temptwo by 33\relax
\advance\JALALI@tempthree by -\JALALI@temptwo
\ifnum\JALALI@tempthree=32\advance\JALALI@temp by 1\fi % if (SY+10) mod 33=32 then Inc(T);
\divide\JALALI@tempthree by 4\relax     % T := T - ((SY+10) mod 33) div 4
\advance\JALALI@temp by -\JALALI@tempthree
\advance\JALALI@temp by -137            % T := T - 137  Adjust the value
\JALALI@farsii=31
\advance\JALALI@farsii by -\JALALI@temp                 % now 31 - T is the farsii
%
\JALALI@farsiii = 30\relax
\ifJALALI@kabiseh
  \JALALI@farsiiii = 30\relax
\else
  \JALALI@farsiiii = 29\relax
\fi
\JALALI@farsiiv  = 31\relax
\JALALI@farsiv   = 31\relax
\JALALI@farsivi  = 31\relax
\JALALI@farsivii = 31\relax
\JALALI@farsiviii= 31\relax
\JALALI@farsiix  = 31\relax
\JALALI@farsix   = 30\relax
\JALALI@farsixi  = 30\relax
\JALALI@farsixii = 30\relax
\JALALI@farsixiii= 30\relax
%
\JALALI@dn= 0\relax
\JALALI@sn= 0\relax
\JALALI@mminusone=\JALALI@m
\advance\JALALI@mminusone by -1\relax
%
\JALALI@i=0\relax
\ifnum\JALALI@i < \JALALI@mminusone
\loop
\advance \JALALI@i by 1\relax
\advance\JALALI@dn by \csname JALALI@latin\romannumeral\the\JALALI@i\endcsname
\ifnum\JALALI@i<\JALALI@mminusone \repeat
\fi
\advance \JALALI@dn by \JALALI@d
%
\JALALI@i=1\relax
\JALALI@sn = \JALALI@farsii
\ifnum \JALALI@sn<\JALALI@dn
\loop
\advance \JALALI@i by 1\relax
\advance\JALALI@sn by \csname JALALI@farsi\romannumeral\the\JALALI@i\endcsname
\ifnum \JALALI@sn<\JALALI@dn \repeat
\fi
\ifnum \JALALI@i < 4
   \JALALI@m = 9 \advance\JALALI@m by \JALALI@i
   \advance \JALALI@y by -622\relax
\else
   \JALALI@m = \JALALI@i \advance \JALALI@m by -3\relax
   \advance \JALALI@y by -621\relax
\fi
\advance\JALALI@sn by -\csname JALALI@farsi\romannumeral\the\JALALI@i%
\endcsname
\ifnum\JALALI@i = 1
  \JALALI@d = \JALALI@dn \advance \JALALI@d by 30 \advance\JALALI@d by -\JALALI@farsii
\else
  \JALALI@d = \JALALI@dn \advance \JALALI@d by -\JALALI@sn
\fi
%% DATE FORMATTING
\if@RTL{\farsidigits{\number\JALALI@d}\space%
\Jalalimonth{\JALALI@m}\space\farsidigits{\number\JALALI@y}}%
\else
\number\JALALI@d\space\JalalimonthEnglish{\JALALI@m}%
\space\number\JALALI@y%
\fi}
%%%
\def\Jalalimonth#1{\ifcase#1\or فروردین\or
اردیبهشت\or خرداد\or تیر\or مرداد\or شهریور%
\or مهر\or آبان\or آذر\or دی\or بهمن\or اسفند%
\fi}
\def\JalalimonthEnglish#1{\ifcase#1%
\or Farvardīn\or Ordībehesht\or Khordād\or Tīr
\or Mordād\or Shahrīvar\or Mihr\or Ābān\or Āzar
\or Dai\or Bahman\or Esfand\fi}
\endinput

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