code: def modified(self):
          
          value = self._proto.last_modified_time
          if value is not None and value != 0:
              # value will be in milliseconds.
              return google.cloud._helpers._datetime_from_microseconds(
                  1000.0 * float(value)
              )
docs: Union[datetime.datetime, None]: Datetime at which the model was last
          modified (:data:`None` until set from the server).
  
          Read-only.