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(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=" 已运行"+diffYears+" 年 "+diffDays+" 天 "+diffHours+" 小时 "+diffMinutes+" 分钟 "+diffSeconds+" 秒"

}

siteTime()