JSFiddle - React, Tailwind, and code Playground

by Sohnee

HTML

<div id="counter"></div>

JavaScript

var startTime = new Date();

var updateCounter = function () {
    var displayArea = document.getElementById("counter");
    var currentTime = new Date();
    var differenceInSeconds = Math.round((currentTime - startTime) / 1000, 0);
    displayArea.innerHTML = differenceInSeconds ;
}
    
window.setInterval(updateCounter, 1000);