Java Calendar 设置当天0点0时0分 或当天最后一秒

       Calendar calendar = Calendar.getInstance();
        calendar.setTimeInMillis(lastTime.longValue());
        calendar.set(Calendar.HOUR_OF_DAY,0);
        calendar.set(Calendar.MINUTE,0);
        calendar.set(Calendar.SECOND,0);
      long DATE_START = calendar.getTimeInMillis();
       calendar.set(Calendar.HOUR_OF_DAY,23);
        calendar.set(Calendar.MINUTE,59);
        calendar.set(Calendar.SECOND,59);

注意 小时 HOUR_OF_DAY