How to add countdown timer by JavaScript

Add this following code in your html support code file: How to add countdown timer by JavaScript How to add countdown timer by JavaScriptexpound­­­­softtechsolution How to add countdown timer by JavaScript.How to add countdown timer by JavaScript
<span id="demo"></span>


<script>
var countDownDate = new Date("march 21, 2022 23:37:25").getTime();

var x = setInterval(function() {

  var now = new Date().getTime();
    
  var distance = countDownDate - now;
    
  var hours = Math.floor((distance % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
  var minutes = Math.floor((distance % (1000 * 60 * 60)) / (1000 * 60));
  var seconds = Math.floor((distance % (1000 * 60)) / 1000);
    
  document.getElementById("demo").innerHTML = hours + "h "
  + minutes + "m " + seconds + "s ";
    
  if (distance < 0) {
    clearInterval(x);
    document.getElementById("demo").innerHTML = "EXPIRED";
  }
}, 1000);
</script>