话不多说，代码摆上来壮威！
本站使用代码：
- <html>
- <center>
- 网站已运行: <span id="run_time" style="color:red" ></span>
- </center>
- </html>
- <script>
- function runTime(){
- var d = new Date(),str = '';
- BirthDay=new Date("march 08,2017");
- today=new Date();
- timeold=(today.getTime()-BirthDay.getTime());
- sectimeold=timeold/1000
- secondsold=Math.floor(sectimeold);
- msPerDay=24*60*60*1000
- msPerYear=365*24*60*60*1000
- e_daysold=timeold/msPerDay
- e_yearsold=timeold/msPerYear
- daysold=Math.floor(e_daysold);
- yearsold=Math.floor(e_yearsold);
- str = yearsold+"年"+daysold+"天";
- str += d.getHours()+'时';
- str += d.getMinutes()+'分';
- str+= d.getSeconds()+'秒';
- return str;
- }
- setInterval(function(){$('#run_time').html(runTime())},1000);
- </script>
第二种
<span id="sitetime"></span>
<script language=javascript>
function siteTime(){
window.setTimeout("siteTime()", 1000);
var seconds = 1000;
var minutes = seconds * 60;
var hours = minutes * 60;
var days = hours * 24;
var years = days * 365;
var today = new Date();
var todayYear = today.getFullYear();
var todayMonth = today.getMonth()+1;
var todayDate = today.getDate();
var todayHour = today.getHours();
var todayMinute = today.getMinutes();
var todaySecond = today.getSeconds();
/* Date.UTC() -- 返回 date 对象距世界标准时间(UTC)1970 年 1 月 1 日午夜之间的毫秒数(时间戳)
year - 作为 date 对象的年份，为 4 位年份值
month - 0-11 之间的整数，做为 date 对象的月份
day - 1-31 之间的整数，做为 date 对象的天数
hours - 0(午夜 24 点)-23 之间的整数，做为 date 对象的小时数
minutes - 0-59 之间的整数，做为 date 对象的分钟数
seconds - 0-59 之间的整数，做为 date 对象的秒数
microseconds - 0-999 之间的整数，做为 date 对象的毫秒数 */
var t1 = Date.UTC(2016,12,01,00,00,00); //北京时间 2016-12-1 00:00:00
var t2 = Date.UTC(todayYear,todayMonth,todayDate,todayHour,todayMinute,todaySecond);
var diff = t2-t1;
var diffYears = Math.floor(diff/years);
var diffDays = Math.floor((diff/days)-diffYears*365);
var diffHours = Math.floor((diff-(diffYears*365+diffDays)*days)/hours);
var diffMinutes = Math.floor((diff-(diffYears*365+diffDays)*days-diffHours*hours)/minutes);
var diffSeconds = Math.floor((diff-(diffYears*365+diffDays)*days-diffHours*hours-diffMinutes*minutes)/seconds);
document.getElementById("sitetime").innerHTML=" 已运行"+diffYears+" 年 "+diffDays+" 天 "+diffHours+" 小时 "+diffMinutes+" 分钟 "+diffSeconds+" 秒";
}
siteTime();
</script>
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