code: def isoformat(self):
          
          text = [self.strftime('%Y-%m-%dT%H:%M:%S'), ]
          if self.tzinfo:
              text.append(self.tzinfo.as_timezone())
          else:
              text.append('+00:00')
          return ''.join(text)
docs: Generate an ISO 8601 formatted time stamp.
  
          Returns:
              str: `ISO 8601`_ formatted time stamp
  
          .. _ISO 8601: http://www.cl.cam.ac.uk/~mgk25/iso-time.html