JSFiddle - React, Tailwind, and code Playground

HTML

<label id="timer"></label>

JavaScript

var d = new Date(Date.UTC(2014,12,12,17,11,36));
setInterval(function() {
        d.setSeconds(d.getSeconds() + 1);
        $('#timer').text((d.getHours() +':' + d.getMinutes() + ':' + d.getSeconds() ));
    }, 1000);