code: def render(self, datestring):
          
          formats = ["%Y-%m-%dT%H:%M:%S.%f", "%Y-%m-%d %H:%M:%S.%f",
                     "%Y-%m-%dT%H:%M:%S", "%Y-%m-%d %H:%M:%S"]
          if datestring:
              for format in formats:
                  try:
                      parsed = datetime.strptime(datestring, format)
                      if not timezone.is_aware(parsed):
                          parsed = timezone.make_aware(parsed, timezone.utc)
                      return parsed
                  except Exception:
                      pass
          return None
docs: Parses a date-like string into a timezone aware Python datetime.