在JSP下如何计算时间差

OGeek|极客世界-中国程序员成长平台 › 门户 › 编程› JavaScript›JavaScript编程经验

原作者: [db:作者] 来自: [db:来源] 收藏邀请

<%@ page contentType="text/html;charset=gb2312"%>

<%@ page import="java.text.*"%>

<%@ page import="java.util.*"%>

<%

//字符串转化成时间类型（字符串可以是任意类型，只要和SimpleDateFormat中的格式一致即可）

java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat("M/dd/yyyy hh:mm:ss a",java.util.Locale.US);

java.util.Date d = sdf.parse("5/13/2003 10:31:37 AM");

out.println(d);

out.println(" ");

SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

String mDateTime1=formatter.format(d);

out.println(mDateTime1);

out.println(" ");

out.println(d.getTime());

out.println(" ");

//当前时间

Calendar cal = Calendar.getInstance();

// SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss G E D F w W a E F");

String mDateTime=formatter.format(cal.getTime());

out.println(mDateTime);

out.println(" ");

//1年前日期

java.util.Date myDate=new java.util.Date();

long myTime=(myDate.getTime()/1000)-60*60*24*365;

myDate.setTime(myTime*1000);

String mDate=formatter.format(myDate);

out.println(mDate);

out.println(" ");

//明天日期

myDate=new java.util.Date();

myTime=(myDate.getTime()/1000)+60*60*24;

myDate.setTime(myTime*1000);

mDate=formatter.format(myDate);

out.println(mDate);

out.println(" ");

//两个时间之间的天数

SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd");

java.util.Date date= myFormatter.parse("2003-05-1");

java.util.Date mydate= myFormatter.parse("1899-12-30");

long day=(date.getTime()-mydate.getTime())/(24*60*60*1000);

out.println(day);

out.println(" ");

//加半小时

SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");

java.util.Date date1 = format.parse("2002-02-28 23:16:00");

long Time=(date1.getTime()/1000)+60*30;

date1.setTime(Time*1000);

String mydate1=formatter.format(date1);

out.println(mydate1);

out.println(" ");

//年月周求日期

SimpleDateFormat formatter2 = new SimpleDateFormat("yyyy-MM F E");

java.util.Date date2= formatter2.parse("2003-05 5 星期五");

SimpleDateFormat formatter3 = new SimpleDateFormat("yyyy-MM-dd");

String mydate2=formatter3.format(date2);

out.println(mydate2);

out.println(" ");

//求是星期几

mydate= myFormatter.parse("2001-1-1");

SimpleDateFormat formatter4 = new SimpleDateFormat("E");

String mydate3=formatter4.format(mydate);

out.println(mydate3);

out.println(" ");

%>
===========================
另一种
import java.text.DateFormat;
import java.text.ParseException;
import java.util.Date;
class test
{
public static void main(String[] args) throws ParseException
{
 DateFormat df=DateFormat.getDateInstance();
 String str1="2002-3-4";
 String str2="2002-7-12";
 long l1=df.parse(str1).getTime();//把字符串转化为时间
 long l2=df.parse(str2).getTime();
 long l3=0;//时间间隔
 if(l1>l2)//判断时间先后
 {
 l3=l1-l2;
 }else
 {
 l3=l2-l1;
 }
 l3=l3/(60*60*24*1000);
 System.out.println(str1+"与"+str2+"相隔"+l3+"天!");
}
}