JSFiddle - React, Tailwind, and code Playground

by panique

HTML

<pre id="output"></pre>

JavaScript

var date1 = new Date(2000, 10, 17),
    date2 = new Date(2000, 10, 20);

document.getElementById('output').innerHTML = Math.floor((date2 - date1) / (1000*60*60*24));