JSFiddle - React, Tailwind, and code Playground

HTML

<script src="//cdnjs.cloudflare.com/ajax/libs/moment.js/2.8.3/moment.min.js"></script>
<span id="output"></span>

JavaScript

var momentObj = moment("12:15 PM", ["h:mm A"])
document.getElementById("output").innerText = momentObj.format("HH:mm");