CodeBox/SimpleHTML at master · ThiruVaithiya/CodeBox · GitHub

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<!DOCTYPE html>
<html>
<body>

<h1>JavaScript Dates</h1>

<p>Add zeros and colons to display the time:</p>

<p id="demo"></p>

<script>
function addZero(x,n) {
 while (x.toString().length < n) {
 x = "0" + x;
 }
 return x;
}

const d = new Date();
let h = addZero(d.getHours(), 2);
let m = addZero(d.getMinutes(), 2);
let s = addZero(d.getSeconds(), 2);
let ms = addZero(d.getMilliseconds(), 3);
let time = h + ":" + m + ":" + s + ":" + ms;
document.getElementById("demo").innerHTML = time;
</script>

</body>
</html>