<span id="timeDate">载入天数...</span><span id="times">载入时分秒...</span><script>// <![CDATA[
var now = new Date(); 
function createtime(){ var grt= new Date("11/25/2013 21:51:00");//此处修改你的建站时间或者网站上线时间 
now.setTime(now.getTime()+250); 
days = (now - grt ) / 1000 / 60 / 60 / 24; dnum = Math.floor(days); 
hours = (now - grt ) / 1000 / 60 / 60 - (24 * dnum); hnum = Math.floor(hours); 
if(String(hnum).length ==1 ){hnum = "0" + hnum;} minutes = (now - grt ) / 1000 /60 - (24 * 60 * dnum) - (60 * hnum); 
mnum = Math.floor(minutes); if(String(mnum).length ==1 ){mnum = "0" + mnum;} 
seconds = (now - grt ) / 1000 - (24 * 60 * 60 * dnum) - (60 * 60 * hnum) - (60 * mnum); 
snum = Math.round(seconds); if(String(snum).length ==1 ){snum = "0" + snum;} 
document.getElementById("timeDate").innerHTML = "本站已安全运行"+dnum+"天"; 
document.getElementById("times").innerHTML = hnum + "小时" + mnum + "分" + snum + "秒"; } 
setInterval("createtime()",250);
// ]]></script>