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function getTimeString(dateVal){
return dateVal.getFullYear()+"-"+(dateVal.getMonth()<9?"0"+(dateVal.getMonth()+1):dateVal.getMonth()+1)
+"-"+(dateVal.getDate()<10?"0"+dateVal.getDate():dateVal.getDate())
+" "+(dateVal.getHours()<10?"0"+dateVal.getHours():dateVal.getHours())
+":"+(dateVal.getMinutes()<10?"0"+dateVal.getMinutes():dateVal.getMinutes())
+":"+(dateVal.getSeconds()<10?"0"+dateVal.getSeconds():dateVal.getSeconds());
}
<script src="http://code.jquery.com/jquery-1.9.1.js"></script>
<script type="text/javascript">
$(function(){
var num=0;
setInterval(function(){
var val=new Date(new Date(2016,0,12,13,34,26).getTime()+(num++)*1000);
$("#showTime").html(getTimeString(val));
},1000)
});
function getTimeString(dateVal){
return dateVal.getFullYear()+"-"+(dateVal.getMonth()+1)+"-"+dateVal.getDate()+" "+dateVal.getHours()+":"+dateVal.getMinutes()+":"+dateVal.getSeconds();
}
</script>
<body>
<div id="showTime"></div>
</body>