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");
}
}