Calendrical Calculations

29 days 30 days absolute date absolute-from-gregorian list 12 absolute-from-islamic list month absolute-from-julian list algorithmic alternative-day approx quotient approximation birthdate C.E. Julian CALENDRICAL CALCULATIONS century Common Lisp date of Easter day by subtraction Day in Gregorian days 11 days in prior death-month death-year defun Dhu al-Hijjah epact extract-day date extract-year date form month day given Gregorian Gregorian calendar Gregorian date Gregorian month Hebrew calendar Hebrew Jewish hebrew-calendar-elapsed-days hebrew-leap-year Heshvan holidays occur integers Islamic calendar Islamic holidays Islamic Moslem jan1 January Julian calendar kday Kday-on-or-before Kislev last day last-day-of-gregorian-month last-day-of-hebrew-month leap days leap year structure list month day long-heshvan lunar mean conjunction Metonic cycle Monday month extract-month date Muharram ninth-of-av Nisan Nth-Kday number of days occurring in Gregorian old civil paschal-moon Passover prior months Purim purim-date religious holidays return 29 Returns the absolute Rosh HaShanah Search forward shifted-epact short-kislev solar sum y approx Sunday Tisha B'Av Tishri Tzom Teveth