code: def timestamp(self, posix: bool = True, **kwargs) -> Union[str, int]:
          
          stamp = self.datetime(**kwargs)
  
          if posix:
              return timegm(stamp.utctimetuple())
  
          return stamp.strftime('%Y-%m-%dT%H:%M:%SZ')
docs: Generate random timestamp.
  
          :param posix: POSIX time.
          :param kwargs: Kwargs for :meth:`~Datetime.datetime()`.
          :return: Timestamp.