dateformat.py 文件源码

def Z(self):
        """
        Time zone offset in seconds (i.e. '-43200' to '43200'). The offset for
        timezones west of UTC is always negative, and for those east of UTC is
        always positive.

        If timezone information is not available, this method returns
        an empty string.
        """
        if not self.timezone:
            return ""

        try:
            offset = self.timezone.utcoffset(self.data)
        except Exception:
            # pytz raises AmbiguousTimeError during the autumn DST change.
            # This happens mainly when __init__ receives a naive datetime
            # and sets self.timezone = get_default_timezone().
            return ""

        # `offset` is a datetime.timedelta. For negative values (to the west of
        # UTC) only days can be negative (days=-1) and seconds are always
        # positive. e.g. UTC-1 -> timedelta(days=-1, seconds=82800, microseconds=0)
        # Positive offsets have days=0
        return offset.days * 86400 + offset.seconds