How TO - JavaScript Countdown Timer
Learn how to create a countdown timer with JavaScript.
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Creating a Countdown Timer
Example
<!-- Display the countdown timer in an element -->
<p id="demo"></p>
<script>
// Set the date we're counting down to
var countDownDate = new Date("Jan 5, 2021 15:37:25").getTime();
//
Update the count down every 1 second
var x = setInterval(function() {
// Get today's date and time
var now = new Date().getTime();
// Find the distance between now and the count down date
var distance = countDownDate - now;
// Time calculations for
days, hours, minutes and seconds
var days = Math.floor(distance /
(1000 * 60 * 60 * 24));
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);
// Display the result in the element with
id="demo"
document.getElementById("demo").innerHTML = days + "d " +
hours + "h "
+ minutes + "m " + seconds + "s ";
// If
the count down is finished, write some text
if (distance < 0) {
clearInterval(x);
document.getElementById("demo").innerHTML
= "EXPIRED";
}
}, 1000);
</script>
Try it Yourself »
Tip: Learn more about the window.setInterval() method in our JavaScript Reference.