code: public static Date dateReservedDay000(Date date) {
          Calendar calendar = Calendar.getInstance();
          calendar.setTime(date);
          return dateReservedDay000(calendar);
      }
docs: 将一个日期的时,分,秒,毫秒置零
  
  @param date 一个日期
  @return 被转化后的日期
  @see #dateReservedDay000(Calendar)