距离某日有多少天的JS

<script type="text/javascript">
var urodz= new Date("August 9,2008");
var s = "2008北京奥运会";
var now = new Date();
var ile = urodz.getTime() - now.getTime();
var dni = Math.floor(ile / (1000 * 60 * 60 * 24));
if (dni > 1)
document.write("今天离"+s+"还有"+dni +"天")
else if (dni == 1)
document.write("只有2天啦！")
else if (dni == 0)
document.write("只有1天啦！")
else
document.write("期待奥运会再次来到中国！");
</script>