utils.py 文件源码

def datetime2timestamp(dt, default_timezone=None):
    """Calculate the timestamp based on the given datetime instance.

    :type dt: datetime
    :param dt: A datetime object to be converted into timestamp
    :type default_timezone: tzinfo
    :param default_timezone: If it is provided as None, we treat it as tzutc().
                             But it is only used when dt is a naive datetime.
    :returns: The timestamp
    """
    epoch = datetime.datetime(1970, 1, 1)
    if dt.tzinfo is None:
        if default_timezone is None:
            default_timezone = tzutc()
        dt = dt.replace(tzinfo=default_timezone)
    d = dt.replace(tzinfo=None) - dt.utcoffset() - epoch
    if hasattr(d, "total_seconds"):
        return d.total_seconds()  # Works in Python 2.7+
    return (d.microseconds + (d.seconds + d.days * 24 * 3600) * 10**6) / 10**6