java计算两个日期时间之间的间隔

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public static String getDatePoor(Date endDate, Date nowDate) {
 
    long nd = 1000 * 24 * 60 * 60;
    long nh = 1000 * 60 * 60;
    long nm = 1000 * 60;
    // long ns = 1000;
    // 获得两个时间的毫秒时间差异
    long diff = endDate.getTime() - nowDate.getTime();
    // 计算差多少天
    long day = diff / nd;
    // 计算差多少小时
    long hour = diff % nd / nh;
    // 计算差多少分钟
    long min = diff % nd % nh / nm;
    // 计算差多少秒//输出结果
    long sec = diff % nd % nh % nm / ns;
    return day + "天" + hour + "小时" + min + "分钟" + sec +"秒";
}