JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.26.0/moment.min.js"></script>
<div id="res"></div>

JavaScript

let a = moment();
let b = moment.unix(a.unix() -  24*60*60);

document.getElementById('res').innerHTML = a.diff(b, 'hours')