JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.5.1/moment.min.js"></script>

JavaScript

console.log("==============");
console.log(Date.UTC(2017, (8-1), 15));
var base = Date.UTC(2017, (8-1), 15)
var newDate = moment();
newDate.set('year', 2017);
newDate.set('month', 7);  // April
newDate.set('date', 15);

console.log(newDate.format('YYYY-MM-DD'));
console.log(newDate.format('X'));