JavaScript中得到日期间隔

    <script type="text/javascript" language="javascript">
        function GetDateTime()
        {
           var vBeginDate=document.all["txbIntendBegin"].value;
           var vEndDate=document.all["txbIntendEnd"].value;
           if(vBeginDate!=null && vEndDate!=null)
           {
                var dBegin=vBeginDate.split(".");
                var dEnd=vEndDate.split(".");
                var dtBegin=new Date(dBegin[0],dBegin[1],dBegin[2]);
                var dtEnd=new Date(dEnd[0],dEnd[1],dEnd[2]);
          //得到间隔天数,去掉24即得到间隔小时
                var TimeSpan=(dtEnd-dtBegin)/(24*60*60*1000);
                if(TimeSpan<0)
                {  
                    //检查
                    alert("截至日期必须大于起始日期!");
                    document.all["txbIntendEnd"].focus();
                    return false;
                }
                else
                {
                    var vWorkLoad= document.getElementById("txbIntendWorkload");
                    if(vWorkLoad!=null)
                    {
                        //界面中显示间隔(天)
                        vWorkLoad.value=TimeSpan.toString();
                    }
                }
           } 
           else
           {
             window.alert("没有资料");
               return false;
           }
           return true;
          
        }

网上上也有其它的方法，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>