JAVA计算两个Date时间差(精确到秒)

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	private static final long nd = 1000 * 24 * 60 * 60;
    private static final long nh = 1000 * 60 * 60;
    private static final long nm = 1000 * 60;

    /** * 计算两个时间段时间差，精确到秒 * @param startTime 2019-04-10 17:16:11 * @param endTime 2019-04-10 17:28:17 * @return */
    public static String computationTime(Date startTime, Date endTime){ 
        try { 
            long diff = endTime.getTime() - startTime.getTime();
            long day = diff / nd;
            long hour = diff % nd / nh;
            long min = diff % nd % nh / nm;
            long sec = diff % nd % nh % nm / 1000;
            return day + " day " + hour + "hour" + min + " min " + sec + "s";
        }catch (Exception e) { 
            e.printStackTrace();
            return null;
        }
    }