You can create a countdown timer in Javascript using the setInterval method. The setInterval() method, repeatedly calls a function or executes a code snippet, with a fixed time delay between each call.
To create a countdown, we need to check the difference between current time and final time and keep updating the countdown. For example,
Example
let countDownDate = new Date("Jul 21, 2020 00:00:00").getTime();
let x = setInterval(() => {
let now = new Date().getTime();
let distance = countDownDate - now;
// Time calculations for days, hours, minutes and seconds
let days = Math.floor(distance / (1000 * 60 * 60 * 24));
let hours = Math.floor((distance % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
let minutes = Math.floor((distance % (1000 * 60 * 60)) / (1000 * 60));
let seconds = Math.floor((distance % (1000 * 60)) / 1000);
console.log(days + "d " + hours + "h " + minutes + "m " + seconds + "s");
// If the count down is finished, write some text
if (distance < 0) {
clearInterval(x);
console.log("completed")
}
}, 1000);Output
This will give the output −
310d 0h 6m 46s 310d 0h 6m 45s 310d 0h 6m 44s 310d 0h 6m 43s 310d 0h 6m 42s 310d 0h 6m 41s 310d 0h 6m 40s 310d 0h 6m 39s 310d 0h 6m 38s 310d 0h 6m 37s 310d 0h 6m 36s 310d 0h 6m 35s 310d 0h 6m 34s 310d 0h 6m 33s