JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>
<div id="test">
</div>

JavaScript

var now = new Date();
var Minutes = now.getMinutes();
var quarterHours = Math.round(Minutes/15);
if (quarterHours == 4)
{
    now.setHours(now.getHours()+1);
}
var rounded = (quarterHours*15)%60;
now.setMinutes(rounded);
now.setSeconds(0);
now.setMilliseconds(0);


console.log(now.getTime());


var currentdate = new Date(now.getTime()); 
var datetime = "Last Sync: " + currentdate.getDate() + "/"
                + (currentdate.getMonth()+1)  + "/" 
                + currentdate.getFullYear() + " @ "  
                + currentdate.getHours() + ":"  
                + currentdate.getMinutes() + ":" 
                + currentdate.getSeconds();


$("#test").text(datetime);