JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://momentjs.com/downloads/moment.min.js"></script>

JavaScript

let d1 =  moment("2019-08-17", "YYYY-M-D");
let d2 =  moment("2019-08-17", "YYYY-MM-DD");
alert(d1);
alert(d2);
alert(d1.isSame(d2));