code: def publish_date(self, publish_date):
          
          if not self.can_update():
              self._tcex.handle_error(910, [self.type])
  
          publish_date = self._utils.format_datetime(publish_date, date_format='%Y-%m-%dT%H:%M:%SZ')
  
          self._data['publishDate'] = publish_date
          request = {'publishDate': publish_date}
          return self.tc_requests.update(self.api_type, self.api_sub_type, self.unique_id, request)
docs: Return Email to.
          :param publish_date:
          :return: