Function _days_before_month

Lib/_pydatetime.py:63–66

year, month -> number of days in year preceding first day of month.

(year, month)

    return _DAYS_IN_MONTH[month]

def _days_before_month(year, month):
    "year, month -> number of days in year preceding first day of month."
    assert 1 <= month <= 12, f"month must be in 1..12, not {month}"
    return _DAYS_BEFORE_MONTH[month] + (month > 2 and _is_leap(year))

def _ymd2ord(year, month, day):
    "year, month, day -> ordinal, considering 01-Jan-0001 as day 1."