JSFiddle - React, Tailwind, and code Playground

HTML

<div id="afficher"></div>

JavaScript

jQuery(function ($) {
    
    setInterval(function () {
        var heure = (new Date()).toLocaleTimeString();
        $("#afficher").html(heure);
    }, 3000); // 3 000 ms => appel toutes les 3 secondes
    
});