code: def publish_time(self):
          
          timestamp = self._message.publish_time
          delta = datetime.timedelta(
              seconds=timestamp.seconds, microseconds=timestamp.nanos // 1000
          )
          return datetime_helpers._UTC_EPOCH + delta
docs: Return the time that the message was originally published.
  
          Returns:
              datetime: The date and time that the message was published.