java計算兩個日期相差多少天小時分鍾等

    public static void main(String[] args) {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        long time = sdf.parse("2022-03-21 23:59:59", new ParsePosition(0)).getTime();
        long nd = 1000 * 24 * 60 * 60;
        long nh = 1000 * 60 * 60;
        long nm = 1000 * 60;
        long ns = 1000;
//        // 獲得兩個時間的毫秒時間差異
        long diff = time - System.currentTimeMillis() + 1000;
//        // 計算差多少天
        long day = diff / nd;
//        // 計算差多少小時
        long hour = diff % nd / nh;
//        // 計算差多少分鍾
        long min = diff % nd % nh / nm;
        // 計算差多少秒//輸出結果
        long sec = diff % nd % nh % nm / ns;
        System.out.println(day + "天" + hour + "小時" + min + "分鍾" + sec + "秒");
    }