Moment JS, UTC to Local time

HTML

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

JavaScript

secondDate "2019-12-01"  // formate YYYY-MM-DD;
var day = moment().format('YYYY-MM-DD');
// difference of secondDate - date
alert('day'+secondDate - day)