Completely remove timezone information, if any.

        :return: the new string if timezone was found, `None` otherwise

def remove_timezone(cls, timestr):
        """Completely remove timezone information, if any.

        :return: the new string if timezone was found, `None` otherwise
        """
        if re.match(r".*[\-+]?\d{2}:\d{2}$", timestr):
            return re.sub(
                r"(.*)(\s[\+-]?\d\d:\d\d)$",
                r"\1",
                timestr
            )