javascript 日期相减-在线教程(附代码)

代码如下：

<SCRIPT LANGUAGE="JavaScript">
<!--
//说明:这里用了Math.ceil()函数,向上取整,即零头算一天,^_^
var strDate1 = "2003-06-17 03:03:40.0";
var strDate2 = "2004-09-18 12:03:12.0";
strDate1=strDate1.substring(0,strDate1.lastIndexOf(".")).replace(/-/g,"/");
strDate2=strDate2.substring(0,strDate2.lastIndexOf(".")).replace(/-/g,"/");
var date1 = Date.parse(strDate1);
var date2 = Date.parse(strDate2);
alert("strDate2与strDate1相差"+Math.ceil((date2-date1)/(24*60*60*1000))+"天")
//-->
</SCRIPT>

<SCRIPT LANGUAGE="JavaScript">
<!--

var strDate1 = "2004-09-17 03:03:00.0";
var strDate2 = "2004-09-17 04:05:00.0";
strDate1=strDate1.substring(0,strDate1.lastIndexOf(".")).replace(/-/g,"/");
strDate2=strDate2.substring(0,strDate2.lastIndexOf(".")).replace(/-/g,"/");
var date1 = Date.parse(strDate1);
var date2 = Date.parse(strDate2);
alert("strDate2与strDate1相差"+(date2-date1)/(60*60*1000)+"小时")
//-->
</SCRIPT>

来源：http://www.360doc.com/content/06/0817/11/10961_183412.shtml