HTML5代码

<div  id="time">
            <span id="hour"></span>
            <span id="data"></span>
</div>

CSS代码

#time{
    float: right;
    width: auto;
    padding:0 50px;
    border-left: 2px solid  rgba(255,255,255,.3);
    height: 54px;
    margin-top: 13px;
    margin-left: 40px;
    color:#fff;
    cursor: default;
    text-align: center;
}
#hour{
    display: block;
    width: auto;
    font-size: 22px;
    height: 34px;
    line-height: 34px;
    color:#fff;
    cursor: default;
}
#data{
    display: block;
    width: auto;
    font-size: 10px;
    height:20px;
    line-height: 20px;
    color:#fff;
    cursor: default;
}

jquery代码

/*时间计数器*/
function p(s) {

    return s < 10 ? '0' + s: s;

}

function nowtime() {
    var myDate = new Date();
    var year = myDate.getFullYear(); //获取当前年
    var month = myDate.getMonth()+1; //获取当前月
    var date = myDate.getDate();     //获取当前日
    var h = myDate.getHours();       //获取当前小时数(0-23)
    var m = myDate.getMinutes();     //获取当前分钟数(0-59)
    var s = myDate.getSeconds();
    var data = year+ '-' + p(month)+ "-"+ p(date);
    var hour = p(h)+ ':'+ p(m);
    $("#data").html(data);
    $("#hour").html(hour);
}

nowtime();

setInterval(nowtime,1000);