docs: def ms_to_datetime(ms, tzinfo=None):
      """Convert a millisecond time value to an offset-aware Python datetime object."""
      if not isinstance(ms, (int, long)):
          raise TypeError('expected integer, not %s' % type(ms))
  
      if tzinfo is None:
          tzinfo = mktz()
  
      return datetime.datetime.fromtimestamp(ms * 1e-3, tzinfo)