Remove quotes (single and double) around timezone otherwise
        `dateutil.parser.parse` raises

def remove_quotes_around_tz(cls, timestr):
        """Remove quotes (single and double) around timezone otherwise
        `dateutil.parser.parse` raises
        """
        quoted = cls.QUOTED_TIMEZONE.match(timestr)
        if quoted is not None:
            return quoted.group(1) + quoted.group(2)