JSFiddle - React, Tailwind, and code Playground

HTML

<h1>tvoja stranica</h1>
<div id='chasiki'></div>

JavaScript

var chasy = document.querySelector("#chasiki");



setInterval(function updateChasy() {
   var tekusheeVremia = new Date(); 
    if (chasy.innerText) {
        chasy.innerText = tekusheeVremia.toString();
    } else {
      chasy.textContent = tekusheeVremia.toString();
    }
    
}, 1000);