code: def QA_util_get_1st_of_next_month(dt):
      
      year = dt.year
      month = dt.month
      if month == 12:
          month = 1
          year += 1
      else:
          month += 1
      res = datetime.datetime(year, month, 1)
      return res
docs: 获取下个月第一天的日期
      :return: 返回日期