js显示客户端时间 <script language="javascript">
           window.setInterval("timer()", 1000);
          function timer(){
       var currDate = new Date();
          document.getElementById("amsTime").innerHTML = currDate.toLocaleString();
             }
             </script>

var currentDate = new Date(<%=new java.util.Date().getTime()%>);

       //var currDate = '<%=sdf.format(new java.util.Date())%>';

 
jsp中取得服务器时间

<script language="javascript">
//从服务器上获取初始时间
var currentDate = new Date(<%=new java.util.Date().getTime()%>);
function run()
{
currentDate.setSeconds(currentDate.getSeconds()+1);
document.getElementById("dt").innerHTML = currentDate.toLocaleString();    
}
window.setInterval("run();", 1000);
</script>
<div id="dt">自动显示时间。。。。</div>