JSFiddle - React, Tailwind, and code Playground
HTML
<script src="https://raw.github.com/timrwood/moment/2.0.0/min/moment.min.js"></script>
JavaScript
var start = moment([1990, 0, 1]);
var end = moment([1900, 0, 1]);
console.log(start.from(end));
console.log(start.from(end, true));
console.log(start.diff(end, "years"));