JSFiddle - React, Tailwind, and code Playground

HTML

<span class="mytime">8:18</span>

JavaScript

$(function () {
    var timeElements = $('.mytime').text().split(":");    
    var theHour = parseInt(timeElements[0]);
    var theMintute = timeElements[1];
    var newHour = theHour + 24;
    $('.mytime').text(newHour + ":" + theMintute);
});