78fd532000-07-12Mirar (Pontus Hagland) //! //! module Calendar //! submodule Coptic //! //! This is the Coptic Orthodox Church calendar, //! that starts the 11th or 12th September and has //! 13 months. //! //! note: //! The (default) names of the months //! are different then other the emacs calendar; //! I do not know which ones are used - the difference //! seem to be only the transcription of the phonetic sounds //! (B &lt;-&gt; P, etc). //! //! I do not know for how long back the calendar is valid, //! either. My sources claim that the calendar is synchronized //! with the <ref>Gregorian</ref> calendar, which is odd. //!
a20af62000-09-26Fredrik Hübinette (Hubbe) #pike __VERSION__
78fd532000-07-12Mirar (Pontus Hagland) import "."; // inherit some rules from Gregorian, like week numbering inherit Gregorian:Gregorian; string calendar_name() { return "Coptic"; } private static mixed __initstuff=lambda() { f_week_day_shortname_from_number="gregorian_week_day_shortname_from_number"; f_week_day_name_from_number="gregorian_week_day_name_from_number"; f_week_day_number_from_name="gregorian_week_day_number_from_name"; f_year_name_from_number="coptic_year_name_from_number"; f_month_name_from_number="coptic_month_name_from_number"; f_month_shortname_from_number="coptic_month_shortname_from_number"; f_month_number_from_name="coptic_month_number_from_name"; f_week_name_from_number="week_name_from_number"; }(); static constant year_offset=-284; static constant start=1720949; static array year_from_julian_day(int jd) { int d=jd-start; int century=(4*d+3)/146097; int century_jd=(century*146097)/4; int century_day=d-century_jd; int century_year=(100*century_day+75)/36525; return ({ century*100+century_year+year_offset, start+century_year*365+century_year/4+century_jd, }); } static int julian_day_from_year(int y) { y-=year_offset; return start+y*365+y/4-y/100+y/400; } static int year_leap_year(int y) { y-=year_offset; werror("%O\n",y); return (!(((y)%4) || (!((y)%100) && ((y)%400)))); } static array(int) year_month_from_month(int y,int m) { // [y,m,ndays,myd] y+=(m-1)/13; m=1+(m-1)%13; return ({y,m,m==13?year_leap_year(y)+5:30,1+30*(m-1)}); } static array(int) month_from_yday(int y,int yd) { // [month,day-of-month,ndays,month-year-day] int m=(yd-1)/30+1; int myd=1+30*(m-1); return ({m,1+yd-myd,m==13?year_leap_year(y)+5:30,myd}); } class cYear { inherit Gregorian::cYear; int number_of_months() { return 13*n; } }