datetime_utils.py 文件源码

def serialize_date(dt):
    if isinstance(dt, (bytes, text_type)):
        return native_(dt)
    if isinstance(dt, timedelta):
        dt = _now() + dt
    if isinstance(dt, (datetime, date)):
        dt = dt.timetuple()
    if isinstance(dt, (tuple, time.struct_time)):
        dt = calendar.timegm(dt)
    if not (isinstance(dt, float) or isinstance(dt, integer_types)):
        raise ValueError(
            "You must pass in a datetime, date, time tuple, or integer object, "
            "not %r" % dt)
    return formatdate(dt, usegmt=True)