一、日期减去天数等于第二个日期

function cc(dd,dadd)

...{

//可以加上错误处理

var a = new Date(dd)

a = a.valueOf()

a = a - dadd * 24 * 60 * 60 * 1000

a = new Date(a)

alert(a.getFullYear() + "年" + (a.getMonth() + 1) + "月" + a.getDate() + "日")

}

cc("12/23/2002",2)

这里不得不做补充,浪费好多时间得出教训:

Javascript 对时间的代号

0-11数字表示1-12月: var a= new Date(2006,5,6) 结果是2006-6-6

0-6表示星期

1-31表示日期

0-23小时

0-59分钟,秒

二。//两个日期的差值(d1 - d2).

function DateDiff(d1,d2){

    var day = 24 * 60 * 60 *1000;

try{

        var dateArr = d1.split("-");

   var checkDate = new Date();

        checkDate.setFullYear(dateArr[0], dateArr[1]-1, dateArr[2]);

   var checkTime = checkDate.getTime();

   var dateArr2 = d2.split("-");

   var checkDate2 = new Date();

        checkDate2.setFullYear(dateArr2[0], dateArr2[1]-1, dateArr2[2]);

   var checkTime2 = checkDate2.getTime();

   var cha = (checkTime - checkTime2)/day;

        return cha;

    }catch(e){

   return false;

}

}//end fun

三、应用：

<script language="javascript" type="text/javascript">

var flag = Array();//全局变量

var start = "2009-01-01";

var end = "2009-02-24";

SetFlag(start,end); 

for(var i=0; i<flag.length; i++){

   document.write(flag[i]+"\n\r");

}

//设置周期内的日期(数组)

function SetFlag(start,end){

var cdate = Array();

cdate = start.split("-");

var cd = cdate[1]+"/"+cdate[2]+"/"+cdate[0];

var dayNum = DateDiff(end,start);

for(var i=0; i<=dayNum; i++){

   flag.push(AddDays(cd,i));

}

}//end fun

//日期加上天数后的新日期.

function AddDays(date,days){

var nd = new Date(date);

   nd = nd.valueOf();

   nd = nd + days * 24 * 60 * 60 * 1000;

   nd = new Date(nd);

   //alert(nd.getFullYear() + "年" + (nd.getMonth() + 1) + "月" + nd.getDate() + "日");

var y = nd.getFullYear();

var m = nd.getMonth()+1;

var d = nd.getDate();

if(m <= 9) m = "0"+m;

if(d <= 9) d = "0"+d;

var cdate = y+"-"+m+"-"+d;

return cdate;

}

//两个日期的差值(d1 - d2).

function DateDiff(d1,d2){

    var day = 24 * 60 * 60 *1000;

try{

        var dateArr = d1.split("-");

   var checkDate = new Date();

        checkDate.setFullYear(dateArr[0], dateArr[1]-1, dateArr[2]);

   var checkTime = checkDate.getTime();

   var dateArr2 = d2.split("-");

   var checkDate2 = new Date();

        checkDate2.setFullYear(dateArr2[0], dateArr2[1]-1, dateArr2[2]);

   var checkTime2 = checkDate2.getTime();

   var cha = (checkTime - checkTime2)/day;

        return cha;

    }catch(e){

   return false;

}

}//end fun

</script>

#javascript小功能模块