JSFiddle - React, Tailwind, and code Playground

HTML

<div id="output"></div>

JavaScript

var date = new Date();
console.log(date);
var dayOfWeek = 2;
function getLastDayOf(dayOfWeek, date) {
    var secondsInDay = 86400;
    var startDay = date.getDay();
    var daysTillLast = -(startDay  - dayOfWeek + 5) % 7;
    return new Date(date.getTime() + secondsInDay * daysTillLast );
}
var day = getLastDayOf(dayOfWeek,date);
console.log(day);
$("#output").text(day);