JSFiddle - React, Tailwind, and code Playground
by phpmind
HTML
<script>
var someDate = new Date("2014-06-20");
var numberOfDaysToAdd = 6;
someDate.setDate(someDate.getDate() + numberOfDaysToAdd);
var dd = someDate.getDate();
var mm = someDate.getMonth() + 1;
var y = someDate.getFullYear();
var someFormattedDate = y +'-'+ mm +'-'+dd;
alert(someFormattedDate);
</script>