docs: def new_datetime(d):
      """
      Generate a safe datetime from a datetime.date or datetime.datetime object.
      """
      kw = [d.year, d.month, d.day]
      if isinstance(d, real_datetime):
          kw.extend([d.hour, d.minute, d.second, d.microsecond, d.tzinfo])
      return datetime(*kw)