JSFiddle - React, Tailwind, and code Playground

by Raman Bedi

HTML

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

JavaScript

function startTimer(duration, display) {
    var start = Date.now(),
        diff,
        hours,
        minutes,
        seconds;
    function timer() {
        // get the number of seconds that have elapsed since 
        // startTimer() was called
        diff = duration - (((Date.now() - start) / 1000) | 0);

        // does the same job as parseInt truncates the float
        
        minutes = (diff / 60) | 0;
        seconds = (diff % 60) | 0;

        if(minutes >= 60){
        	 hours = (minutes / 60) | 0;
           minutes = (minutes % 60) | 0;
        }else{
           hours = 0;
        }
       
        hours = hours < 10 ? "0" + hours : hours;
        minutes = minutes < 10 ? "0" + minutes : minutes;
        seconds = seconds < 10 ? "0" + seconds : seconds;

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

        if (diff <= 0) {
            // add one second so that the count down starts at the full duration
            // example 05:00 not 04:59
            start = Date.now() + 1000;
        }
    };
    // we don't want to wait a full second before the timer starts
    timer();
    setInterval(timer, 1000);
}

window.onload = function () {
    var fiveMinutes = 60 * 60 * 5,
        display = document.querySelector('#time');
    startTimer(fiveMinutes, display);
};