idatetime.py 文件源码

def fromordinal(ordinal):
        """Return the datetime from the proleptic Gregorian ordinal.

        January 1 of year 1 has ordinal 1. ValueError is raised unless
        1 <= ordinal <= datetime.max.toordinal().
        The hour, minute, second and microsecond of the result are all 0, and
        tzinfo is None.
        """