效果图：

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HTML代码：

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<h1>根据结束时间和服务器时间 倒计时</h1>
<div class="time-item">
<span id="day_show">0天</span>
<strong id="hour_show">0时</strong>
<strong id="minute_show">0分</strong>
<strong id="second_show">0秒</strong>
</div>

CSS代码：

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h1 {
font-family:"微软雅黑";
font-size:40px;
margin:20px 0;
border-bottom:solid 1px #ccc;
padding-bottom:20px;
letter-spacing:2px;
}
.time-item strong {
background:#C71C60;
color:#fff;
line-height:49px;
font-size:36px;
font-family:Arial;
padding:0 10px;
margin-right:10px;
border-radius:5px;
box-shadow:1px 1px 3px rgba(0,0,0,0.2);
}
#day_show {
float:left;
line-height:49px;
color:#c71c60;
font-size:32px;
margin:0 10px;
font-family:Arial,Helvetica,sans-serif;
}
.item-title .unit {
background:none;
line-height:49px;
font-size:24px;
padding:0 10px;
float:left;
}

JS代码：

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var startTime = '2015-09-22 15:10:12'; //开始时间 或者服务器时间 也可以是客户端时间
startTime = new Date(startTime.replace(/-/, " "));
var endTime = '2015-09-25 09:40:45'; //结束时间
endTime = new Date(endTime.replace(/-/, " "));
var intDiff = parseInt((endTime.getTime() - startTime.getTime()) / 1000); //倒计时总秒数量
function timer(intDiff) {
  window.setInterval(function() {
    var day = 0,
      hour = 0,
      minute = 0,
      second = 0; //时间默认值
    if (intDiff > 0) {
      day = Math.floor(intDiff / (60 * 60 * 24));
      hour = Math.floor(intDiff / (60 * 60)) - (day * 24);
      minute = Math.floor(intDiff / 60) - (day * 24 * 60) - (hour * 60);
      second = Math.floor(intDiff) - (day * 24 * 60 * 60) - (hour * 60 * 60) - (minute * 60);
    }
    if (minute <= 9) minute = '0' + minute;
    if (second <= 9) second = '0' + second;
    $('#day_show').html(day + "天");
    $('#hour_show').html('<s id="h"></s>' + hour + '时');
    $('#minute_show').html('<s></s>' + minute + '分');
    $('#second_show').html('<s></s>' + second + '秒');
    intDiff--;
  }, 1000);
}

$(function() {
  timer(intDiff);
});

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