JSFiddle - React, Tailwind, and code Playground

HTML

<div id="text"></div>

JavaScript

var x = document.getElementById("text");

function displayTime(){
    var start = new Date();
    var display = start.toLocaleString();
    var tmp = document.createElement('li');
    tmp.innerHTML = display;
    x.appendChild(tmp);
}
setInterval(function(){displayTime()},1000);

//why not setInterval(displayTime(),1000);