'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.'

def Z(self):

    if (not self.timezone):
        return 0
    offset = self.timezone.utcoffset(self.data)
    return ((offset.days * 86400) + offset.seconds)
