def clean_timezone(self):
param_name = 'tz'
if param_name not in self.params:
raise ParameterExpected(parameter=param_name)
timezone = self.params[param_name]
try:
user_timezone = pytz.timezone(timezone)
user_now = TimeUtils.get_utc_now_as_local(user_timezone)
LocalUserMiddleware.update(user_timezone=user_timezone,
user_now=user_now)
except pytz.exceptions.UnknownTimeZoneError:
raise BadRequest(message='Unknown timezone.')
