code: public static Date dateReservedMonth999(Date date) {
          Calendar calendar = Calendar.getInstance();
          calendar.setTime(date);
  
          return dateReservedMonth999(calendar);
      }
docs: 将一个日期的日,时,分,秒,毫秒调整为最大值
  
  @param date 一个日期
  @return 被转化后的日期
  @see #dateReservedMonth999(Calendar)