jsp动态时间

<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding= "utf-8"%>
<script type= "text/javascript">
     function setDateTime(){
           var date=new Date();
           var day=date.getDay();
           var week;
           switch(day){
           case 0:week="星期日" ;break;
           case 1:week="星期一" ;break;
           case 2:week="星期二" ;break;
           case 3:week="星期三" ;break;
           case 4:week="星期四" ;break;
           case 5:week="星期五" ;break;
           case 6:week="星期六" ;break;
          }
           var today=date.getFullYear()+"年" +(date.getMonth()+1)+"月"+date.getDate()+ "日  "+week+" "+date.getHours()+":"+date.getMinutes()+ ":"+date.getSeconds();
          document.getElementById( "today").innerHTML=today;
     }
     
     window.setInterval( "setDateTime()", 1000);
     
</script>

<div class= "row-fluid">
     <div class="span12">
           <div class= "head">
               <div class= "headLeft">
                    <img src=" ${pageContext.request.contextPath}/images/logo.png"/>
               </div>
               <div class= "headRight">
                   欢迎管理员： <font color="red" >${currentUser.userName }</font> &nbsp;&nbsp;&nbsp;<font id="today" class="currentDateTime" ></font>
               </div>
           </div>
     </div >
</div>