Moment JS
Example of parsing and formatting a Date with Moment JS.
HTML
<script src="http://momentjs.com/downloads/moment.js"></script>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/lodash.min.js"></script>
1586152800.0
1586154600.0
JavaScript
console.log(moment.unix(1586338920.0).format())
/* console.log(moment('2019-12-16 00:00:00', 'YYYY-MM-DD HH:mm:ss').format()) */
console.log(moment('2020-04-06 12:00:00', 'YYYY-MM-DD HH:mm:ss').unix())