Calendar类计算两个时间差 天 时 分 秒

今天遇到了个需求，需要计算时间差
然后本来想用下面这种写法的

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";
}

然后想了想，好像这么写有点傻，看起来不够高级
于是就使用calendar类来写了
如下:

public static void main(String[] args) throws ParseException {
        Calendar nowCalendar = Calendar.getInstance();
        nowCalendar.setTime(new Date());

        Calendar startCalendar = Calendar.getInstance();
        startCalendar.setTime(org.apache.commons.lang3.time.DateUtils.parseDate("2019-09-29 00:00:00","yyyy-MM-dd HH:mm:ss"));

        //计算天数
        System.out.println(nowCalendar.get(Calendar.DAY_OF_MONTH) - startCalendar.get(Calendar.DAY_OF_MONTH));
        //计算小时
        System.out.println(nowCalendar.get(Calendar.HOUR_OF_DAY) - startCalendar.get(Calendar.HOUR_OF_DAY));
        //计算分钟
        System.out.println(nowCalendar.get(Calendar.MINUTE) - startCalendar.get(Calendar.MINUTE));
        //计算秒
        System.out.println(nowCalendar.get(Calendar.SECOND) - startCalendar.get(Calendar.SECOND));
    }

结果:

1
19
3
28

其实就是Calendar封了一层(划掉

以上