Function _ymd2ord

Lib/_pydatetime.py:68–75

year, month, day -> ordinal, considering 01-Jan-0001 as day 1.

(year, month, day)

    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."
    assert 1 <= month <= 12, f"month must be in 1..12, not {month}"
    dim = _days_in_month(year, month)
    assert 1 <= day <= dim, f"day must be in 1..{dim}, not {day}"
    return (_days_before_year(year) +
            _days_before_month(year, month) +
            day)

_DI400Y = _days_before_year(401)    # number of days in 400 years
_DI100Y = _days_before_year(101)    #    "    "   "   " 100   "