JSFiddle - React, Tailwind, and code Playground
HTML
<div id="date">23/05/2013</div>
JavaScript
var data =$('#date').text();
var arr = data.split('/');
$("#date").html("<h1>"+arr[0] + "</h1></br>" +
"<h2>"+arr[1] + "</h2></br>" +
"<h3>"+arr[2] + "</h3></br>");