JSFiddle - React, Tailwind, and code Playground

by SnehalKadwe

HTML

<body>
    <div>Registration closes in <span id="time"></span> minutes!</div>
</body>

JavaScript

function startTimer(duration, display) {
    var timer = duration, minutes, seconds;
    
    setInterval(function () {
        minutes = parseInt(timer / 60, 10)
        seconds = parseInt(timer % 60, 10);
				
        minutes = minutes < 10 ? "0" + minutes : minutes;
        seconds = seconds < 10 ? "0" + seconds : seconds;

        display.textContent = minutes + ":" + seconds;

				timer--;
        if (timer < 0) {
        		console.log(--timer, );
            timer = duration;
        }
    }, 1000);
}

window.onload = function () {
    var fiveMinutes = 60 * 1,
        display = document.querySelector('#time');
    startTimer(fiveMinutes, display);
};