java 计算两个时间差

两种方法，请自行参考使用

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";
}

    /**
     * 求两个时间相差的时间单位
     * @param smallDate 小时间
     * @param bigDate  大时间
     * @param type 分别为  Calendar.DATE,Calendar.HOUR,Calendar.MINUTE
     * @return 相差数量
     */
    public static long minusTime(Date smallDate,Date bigDate,int type){
        if(smallDate==null||bigDate==null){
            return Integer.MAX_VALUE;
        }
        long diffMillis = Math.abs(bigDate.getTime() - smallDate.getTime());
        switch (type){
            case Calendar.DATE: return TimeUnit.DAYS.convert(diffMillis, TimeUnit.MILLISECONDS);
            case Calendar.HOUR:return TimeUnit.HOURS.convert(diffMillis, TimeUnit.MILLISECONDS);
            case Calendar.MINUTE:return TimeUnit.MINUTES.convert(diffMillis, TimeUnit.MILLISECONDS);
            default:return Integer.MAX_VALUE;
        }
    }