JSFiddle - React, Tailwind, and code Playground
HTML
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.min.js"></script>JavaScript
console.log('00', moment('00', 'H', true).isValid());
console.log('01', moment('01', 'H', true).isValid());
console.log('0', moment('0', 'H', true).isValid());
console.log('1', moment('1', 'H', true).isValid());