code: def created(self):
          
          creation_time = self._properties.get("creationTime")
          if creation_time is not None:
              # creation_time will be in milliseconds.
              return google.cloud._helpers._datetime_from_microseconds(
                  1000.0 * float(creation_time)
              )
docs: Union[datetime.datetime, None]: Datetime at which the dataset was
          created (:data:`None` until set from the server).