时间戳

    public static void main(String[] args) {
   
        Long timestamp = System.currentTimeMillis();
        timestamp += 1000 * 60 * 60 * 8;
        long dayCounts =
                (long) (Math.ceil((double) timestamp / (1000 * 60 * 60 * 24)));
        System.out.println(timestamp);
        System.out.println(dayCounts);
        timestamp %= 1000 * 60 * 60 * 24;//天
        System.out.println(timestamp);
        Long hour = timestamp / (1000 * 60 * 60);//小时
        timestamp %= 1000 * 60 * 60;
        Long minute = timestamp / (1000 * 60);//分钟
        timestamp %= 1000 * 60;//
        Long secont = timestamp / 1000;
        System.out.println(hour);
        System.out.println(minute);
        System.out.println(secont);
    }
}