docs: def add_seconds(datetime_like_object, n, return_date=False):
      """
      Returns a time that n seconds after a time.
  
      :param datetimestr: a datetime object or a datetime str
      :param n: number of seconds, value can be negative
  
      **中文文档**
  
      返回给定日期N秒之后的时间。
      """
      a_datetime = parser.parse_datetime(datetime_like_object)
      a_datetime = a_datetime + timedelta(seconds=n)
      if return_date:  # pragma: no cover
          return a_datetime.date()
      else:
          return a_datetime