这是那个代码哦！
<td><div align="center" class="css_id">
<center> <SCRIPT language=javascript><!--
BirthDay=new Date("july 24,1986");//改成你的计时日期
today=new Date();
timeold=(today.getTime()-BirthDay.getTime());
sectimeold=timeold/1000
secondsold=Math.floor(sectimeold);
msPerDay=24*60*60*1000
e_daysold=timeold/msPerDay
daysold=Math.floor(e_daysold);
e_hrsold=(e_daysold-daysold)*24;
hrsold=Math.floor(e_hrsold);
e_minsold=(e_hrsold-hrsold)*60;
minsold=Math.floor((e_hrsold-hrsold)*60);
seconds=Math.floor((e_minsold-minsold)*60);
//-->
</SCRIPT><SCRIPT language=javascript><!--
document.write("我来到这个世界"+daysold+"天"+hrsold+"小时"+minsold+"分"+seconds+"秒了!");
//-->
</SCRIPT></center></div></td>
把上面改成自己生日就好了！