js动态时间代码

<SCRIPT language=JavaScript>
<!--
function showtime()
{
today=new Date();
var year=today.getYear();
var month=today.getMonth()+1;
var day=today.getDate();
var hours = today.getHours();
var minutes = today.getMinutes();
var seconds = today.getSeconds();
var timeValue= hours;//((hours >12) ? hours -12 :hours);
timeValue += ((minutes < 10) ? ":0" : ":") + minutes+"";
//timeValue += (hours >= 12) ? "PM" : "AM";
timeValue+=((seconds < 10) ? ":0" : ":") + seconds+"";
var timetext=year+"-"+month+"-"+day+" "+timeValue
//document.write("<span onclick=\"document.getElementById('time').value='"+timetext+"'\">"+timetext+"</span>");
document.getElementById("liveclock").innerText = timetext; //div的html是now这个字符串
setTimeout("showtime()",1000); //设置过1000毫秒就是1秒，调用showtime方法
}

-->
</SCRIPT>
<script language="javascript">
window.onload=function(){
showtime();
}
</script>

当前时间：<span id="liveclock"></span>