def unlocalized_datetime_to_ut_seconds(self, unlocalized_datetime):
loc_dt = self._timezone.localize(unlocalized_datetime)<EOL>unixtime_seconds = calendar.timegm(loc_dt.utctimetuple())<EOL>return unixtime_seconds<EOL>
Convert datetime (in GTFS timezone) to unixtime

Parameters
----------
unlocalized_datetime : datetime.datetime
    (tz coerced to GTFS timezone, should NOT be UTC.)

Returns
-------
output : int (unixtime)