JSFiddle - React, Tailwind, and code Playground
by f0t0n
HTML
<div id="d1"></div>
<div id="d2"></div>
<script type="text/javascript">
var d1 = document.getElementById('d1'),
d2 = document.getElementById('d2'),
hours = 3,
date1 = new Date(),
date2 = new Date();
date2.setTime(date1.getTime() + hours * 3600000);
d1.innerHTML = date1;
d2.innerHTML = date2;
</script>