<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物件距世界標準時間(UTC)1970年1月1日午夜之間的毫秒數(時間戳)
        year - 作為date物件的年份，為4位年份值
        month - 0-11之間的整數，做為date物件的月份
        day - 1-31之間的整數，做為date物件的天數
        hours - 0(午夜24點)-23之間的整數，做為date物件的小時數
        minutes - 0-59之間的整數，做為date物件的分鐘數
        seconds - 0-59之間的整數，做為date物件的秒數
        microseconds - 0-999之間的整數，做為date物件的毫秒數 */
 

        var t1 = Date.UTC(2016,12,01,00,00,00); //北京時間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=" 已執行"+diffYears+" 年 "+diffDays+" 天 "+diffHours+" 小時 "+diffMinutes+" 分鐘 "+diffSeconds+" 秒";
    }
    siteTime();
</script>