Moment JS
Example of parsing and formatting a Date with Moment JS.
HTML
<script src="http://momentjs.com/downloads/moment.js"></script>JavaScript
let months = moment().diff(moment('2016-05-30'), 'month', true);
if (months > 12) {
console.log('years:',(months - (months %12))/12 );
} else {
console.log('only months',parseInt(months));
}