注意：是读本地时间啊
CODE如下
<html>
<head>
<title>倒计时</title>
<body>
<script>
var now = new Date("02/09/2015 " + 10 + ":" + 30 + ":" + 30);//开始时间
function GetServerTime()
{
var urodz = new Date("02/10/2015 10:30:30");//截止时间
now.setTime(now.getTime()+250);
days = (urodz - now) / 1000 / 60 / 60 / 24;
daysRound = Math.floor(days);
hours = (urodz - now) / 1000 / 60 / 60 - (24 * daysRound);
hoursRound = Math.floor(hours);
minutes = (urodz - now) / 1000 /60 - (24 * 60 * daysRound) - (60 * hoursRound);
minutesRound = Math.floor(minutes);
seconds = (urodz - now) / 1000 - (24 * 60 * 60 * daysRound) - (60 * 60 * hoursRound) - (60 * minutesRound);
secondsRound = Math.round(seconds);
document.getElementById("date").innerHTML = daysRound;
document.getElementById("time").innerHTML = hoursRound + ":" + minutesRound + ":" + secondsRound;
}
setInterval("GetServerTime()",250);
</script>
<span id="date"></span> <span class="white14b">天</span> <span id="time"></span>
</body>
</html>
本文出自 “PHPer许琴-专注于PHP技术” 博客，请务必保留此出处http://xuqin.blog.51cto.com/5183168/1613233
原文：http://xuqin.blog.51cto.com/5183168/1613233