There is a counter that starts at 0 every time the page is loaded or refresh. Every second, the number in the counter increases by 1 code example
Example 1: javascript get clock time in auto counter up
<html>
<head>
<title>(Type a title for your page here)</title>
<script type="text/javascript">
function display_c(){
var refresh=1000;
mytime=setTimeout('display_ct()',refresh)
}
function display_ct() {
var x = new Date()
document.getElementById('ct').innerHTML = x;
display_c();
}
</script>
</head>
<body onload=display_ct();>
<span id='ct' ></span>
</body>
</html>
Example 2: javascript get clock time in auto counter up
function display_ct() {
var x = new Date()
var x1=x.getMonth() + 1+ "/" + x.getDate() + "/" + x.getYear();
x1 = x1 + " - " + x.getHours( )+ ":" + x.getMinutes() + ":" + x.getSeconds();
document.getElementById('ct').innerHTML = x1;
display_c();
}