JSFiddle - React, Tailwind, and code Playground
HTML
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.21.0/moment.js"></script>
JavaScript
var a = moment([2007, 0, 20]);
var b = moment([2007, 0, 28]);
console.log(a.diff(b, 'days')) // =1