JSFiddle - React, Tailwind, and code Playground

HTML

<div id="result"></div>
<div id="result2"></div>
<div id="result3"></div>

JavaScript

function yyyymmdd(dateIn) {
   var yyyy = dateIn.getFullYear();
   var mm = (dateIn.getMonth()+1); // getMonth() is zero-based
   var dd  = dateIn.getDate();
   return  String(dd +"/"+ mm +"/"+  yyyy) ; // Leading zeros for mm and dd
}

var today = new Date();
$('#result').text(yyyymmdd(today));

var goodOldDays = new Date();
goodOldDays.setFullYear(1973);
$('#result2').text(yyyymmdd(goodOldDays));

var backToTheFuture = new Date();
backToTheFuture.setFullYear(3025);
$('#result3').text(yyyymmdd(backToTheFuture));