<div id="getting-started"></div>
<script src="http://code.jquery.com/jquery-1.10.2.min.js" type="text/javascript"></script>
<script src="http://hilios.github.io/jQuery.countdown/javascripts/jquery.countdown.min.js"></script>
<script type="text/javascript">
  $('#getting-started').countdown('2016/01/01 00:00', function(event) {
    $(this).html(event.strftime('%w 周 %d 天 %H:%M:%S'));
  });
</script>

Y: "years"
m: "months"
w: "weeks"
d: "days"
D: "totalDays"

H: "hours"
M: "minutes"
S: "seconds"

<div id="time" class="time"></div>
<script language=javascript>    
function show_date_time(){  
 window.setTimeout("show_date_time()", 1000);  
 target=new Date(2014,0,15,17,0,0);  //注意：表示月份的參數介于 0 到 11 之間。也就是說，如果希望把月設置為8月，則參數應該是7。
 today=new Date();

 timeold=(target.getTime()-today.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);  

  if (daysold<0) {  
  document.getElementById("time").innerHTML="逾期,倒計時已經失效";  
}  
 else{  
 if (daysold<10) {daysold="0"+daysold}  
 if (hrsold<10) {hrsold="0"+hrsold}  
 if (minsold<10) {minsold="0"+minsold}  
 if (seconds<10) {seconds="0"+seconds}  
 if (daysold>0) {  
  document.getElementById("time").innerHTML="距離結束時間還有："+daysold+"天"+hrsold+"小時"+minsold+"分"+seconds+"秒";  
 }  
 else  
  document.getElementById("time").innerHTML="<font color=red>距離結束時間還有："+daysold+"天"+hrsold+"小時"+minsold+"分"+seconds+"秒</font>";  //結束時間小于1天，字體呈紅色提醒
}  
}  
show_date_time();  
</script>

<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()
var todayDate = today.getDate()
var todayHour = today.getHours()
var todayMinute = today.getMinutes()
var todaySecond = today.getSeconds()

/* Date.UTC() -- 返回date對象距世界標準時間(UTC)1970年1月1日午夜之間的毫秒數(時間戳)
year - 作為date對象的年份，為4位年份值
month - 0-11之間的整數，做為date對象的月份
day - 1-31之間的整數，做為date對象的天數
hours - 0(午夜24點)-23之間的整數，做為date對象的小時數
minutes - 0-59之間的整數，做為date對象的分鐘數
seconds - 0-59之間的整數，做為date對象的秒數
microseconds - 0-999之間的整數，做為date對象的毫秒數 */
var t1 = Date.UTC(2014,0,14,11,19,00)
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=" 已運行"+diffYears+" 年 "+diffDays+" 天 "+diffHours+" 小時 "+diffMinutes+" 分鐘 "+diffSeconds+" 秒"
}
siteTime()
</script>