java中 一个日期加上一个月份后和系统当前日期相比较

参看java.util.Calendar类

你说的不够清楚
不过我估计你问的是这类问题
我把你可能要的答案给你

JavaScript脚本文件代码：
<script language="JavaScript">

var timerID = null;
var timerRunning = false;

function stopclock (){
if(timerRunning)
clearTimeout(timerID);
timerRunning = false;}

function startclock () {
stopclock();
showtime();}

function showtime () {
var now = new Date();
var hours = now.getHours();
var minutes = now.getMinutes();
var seconds = now.getSeconds();
var wday =now.getDay();
switch(wday){
case 1:
wday="星期一";
break;
case 2:
wday="星期二";
break;
case 3:
wday="星期三";
break;
case 4:
wday="星期四";
break;
case 5:
wday="星期五";
break;
case 6:
wday="星期六";
break;
default:
wday="