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How to set a countdown timer in javascript?
We can set a countdown timer in JavaScript using the setInterval() method. This method continuously calls a function or executes a code snippet with a fixed time delay between every call.
The setInterval() method calls a function at described intervals in milliseconds. It continues calling the function until the clearInterval() is called, or the window is closed.
Syntax
Following is the syntax of this method −
setInterval(function, milliseconds);
The setInterval method accepts two parameter functions and milliseconds.
function − A function containing a block of code designed to perform a particular task.
milliseconds − it is the time interval between the execution of the function.
This method returns a positive integer representing the interval ID.
Example
In the following example, we are creating a countdown Timer from a Jan 1, 2027 12:12:50 to the current time.
<!DOCTYPE html>
<html lang="en">
<head>
<title>countDownTimer</title>
<style>
h3 {
text-align: center;
margin-top: 0px;
}
</style>
</head>
<body>
<h3 id="time"></h3>
<script>
// set the date we are counting down to
var countDown = new Date("jan 1, 2027 12:12:50").getTime();
//update the count down in every 1 second
var update = setInterval(function () {
// get the today's date and time
var now = new Date().getTime();
//find the difference b/w countDown and now
var diff = countDown - now;
//now we are calculating time in days, hrs, minutes, and seconds.
var days = Math.floor(diff / (1000 * 60 * 60 * 24));
var hrs = Math.floor((diff % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
var minutes = Math.floor((diff % (1000 * 60 * 60)) / (1000 * 60));
var seconds = Math.floor((diff % (1000 * 60)) / 1000);
//now output the result in an element with id ="time"
document.getElementById("time").innerHTML =
days + "-D: " + hrs + "-H: " + minutes + "-M: " + seconds + "-S ";
if (diff < 0) {
clearInterval(update);
document.getElementById("time").innerHTML = "Expired";
}
}, 1000);
</script>
</body>
</html>
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