JSFiddle - React, Tailwind, and code Playground

HTML

<span id="time"></span>

JavaScript

$(function() {
    var time = $("#time");
    
    function getTime() {
        var now = new Date(),
            hours = now.getHours(),
            minutes = now.getMinutes(),
            seconds = now.getSeconds();
        
        return (hours < 10 ? "0" + hours : hours) + ":" + (minutes < 10 ? "0" + minutes : minutes) + ":" + (seconds < 10 ? "0" + seconds : seconds);
    }
    
    setInterval(function() {
        time.text(getTime());        
    }, 1000);
});