code: def timestamp(self, value):
          
          if not self._timestamp_is_valid(value):
              value = self._calculate_current_timestamp()
          self._timestamp = value
docs: The local time when the message was written.
  
          Must follow the format 'Mmm DD HH:MM:SS'.  If
          the day of the month is less than 10, then it
          MUST be represented as a space and then the
          number.