Module gregorian 

The Gregorian calendar

Constants

DAYS_IN_400_YEAR_CYCLE

The number of days in the 400 year cycle.

Functions

day_before_year

Calculates the day before Jan 1 of year.

days_before_month

The number of days in this year before this month starts

easter

Calculates the date of Easter in the given year

fixed_from_gregorian

Lisp code reference: https://github.com/EdReingold/calendar-code2/blob/1ee51ecfaae6f856b0d7de3e36e9042100b4f424/calendar.l#L1167-L1189

gregorian_from_fixed

Lisp code reference: https://github.com/EdReingold/calendar-code2/blob/1ee51ecfaae6f856b0d7de3e36e9042100b4f424/calendar.l#L1525-L1540

is_leap_year

Whether or not year is a leap year

year_day

Calculates the month/day from the 1-based day of the year

year_from_fixed

Lisp code reference: https://github.com/EdReingold/calendar-code2/blob/1ee51ecfaae6f856b0d7de3e36e9042100b4f424/calendar.l#L1191-L1217