JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.10.6/moment.min.js"></script>

JavaScript

var options = {};

options.locale = 'nl-NL';
moment.locale(options.locale);

console.log(moment());
console.log(moment('01-01-2018').isValid());