docs: def datetimeparse(s):
      """Parse a string date time to a datetime object.
  
      Suitable for dates serialized with .isoformat()
  
      :return: None, or an aware datetime instance, tz=UTC.
      """
      try:
          dt = dateutil.parser.parse(s)
      except ValueError:
          return None
  
      return utc_dt(dt)