两个时间之间 相差多少

package date;

import java.text.SimpleDateFormat;
import java.util.Date;

public class DateCha
{
    public static void main(String[] args) throws Exception
    {
        String strStartTime = "2008-11-19 09:06:15";
        String strEndTime = "2008-11-20 11:56:20";
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
       
        Date start = format.parse(strStartTime);
        Date end = format.parse(strEndTime);
       
        long time = end.getTime() - start.getTime();
       
        long second = 1000;
        long minute = 60 * second;
        long hour = 60 * minute;
        long day = 24 * hour;
       
        long d = time / day;
        long h = (time % day) / hour;
        long m = ((time % day) % hour) / minute;
        long s = (((time % day) % hour) % minute) / second;
       
        System.out.println(d + "天" + h + "小时" + m + "分" + s + "秒");
    }
}