code: def _get_cached_time(self):
          
          if not self._cached_time:
              self._cached_time = self._meta.datetime.utcnow()
  
          return self._cached_time
docs: Method that will allow for consistent modified and archived
          timestamps.
  
          Returns:
              self.Meta.datetime: This method will return a datetime that is
                  compatible with the current class's datetime library.