/*
BirthDay=new Date("Nov,19,2011");//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);
*/

StartTime(2011,11,19) //起始日期更改这个即可。zbhu 2011.8.1。就是现在日期与起始日期的间隔。
function StartTime(Y,M,D)
{
Now=new Date()
Nowy=Now.getYear()
Nowm=Now.getMonth()
Nowd=Now.getDate()
MA=new Array("Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec")
Nowstring=MA[Nowm]+" "+Nowd+", "+Nowy
Paststring=MA[M-1]+" "+D+", "+Y
daysold=(Math.round((Date.parse(Nowstring)-Date.parse(Paststring))/(24*3600000))*1)
}