Function _days_before_year

tools/python-3.11.9-amd64/Lib/datetime.py:46–49

year -> number of days before January 1st of year.

(year)

    return year % 4 == 0 and (year % 100 != 0 or year % 400 == 0)

def _days_before_year(year):
    "year -> number of days before January 1st of year."
    y = year - 1
    return y*365 + y//4 - y//100 + y//400

def _days_in_month(year, month):
    "year, month -> number of days in that month in that year."