计算时间差

计算两个时间的差值

package date0428;

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

/**
 *@author tonyJ<br/>
 *2011-4-28 下午03:58:15
 */
public class Test01 {
	public static void main(String[] args) {
		System.out.println(countTime("2004-01-02 13:31:40","2004-01-02 11:30:24"));
	}
	
	public static  String countTime(String startTime,String endTime){
		String desc=null;
		SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		long countTime=0;
		long day=0;
		long hour=0;
		long min=0;
		long second=0;
		try {
			Date startDate=sdf.parse(startTime);
			Date endDate=sdf.parse(endTime);
			countTime=startDate.getTime()-endDate.getTime();
			day=countTime/(1000*60*60*24);
			hour=countTime/(1000*60*60)-day*24;
			min = countTime/(1000*60)-day*24*60-hour*60;
			second=countTime/1000-day*24*60*60-hour*60*60-min*60;
			//System.out.println(countTime+"-->"+day+"-->"+hour+"-->"+min+"-->"+second);
			if(day==0&&hour==0&&min==0&&second!=0){
				desc="约"+second+"秒前";
			}
			if(day==0&&hour==0&&min!=0){
				desc="约"+min+"分钟前";
			}
			if(day==0&&hour!=0){
				desc="约"+hour+"小时前";
			}
			if(day>3){
				desc=startTime;
			}
		} catch (ParseException e) {
			e.printStackTrace();
		}
		return desc;
	}
}