JSFiddle - React, Tailwind, and code Playground

HTML

<div id="countdown"></div>

JavaScript

function ShowTime() {
  var now = new Date();
    if (now.getHours() > 11){
    var hrs =11-now.getHours() +24;
    }else{
  var hrs = 11-now.getHours();
         }
  var mins = 60-now.getMinutes();
  var secs = 60-now.getSeconds();
   
      timeLeft = "Du har nu "+hrs+' timer '+mins+' minutter '+secs+' sekunder' +" til at gennemføre en ordre og sikre dig levering 1-3 dage fra ordremodtagelse";
  $("#countdown").html(timeLeft);
}

var countdown;
function StopTime() {
	clearInterval(countdown);
	
}

setInterval(ShowTime ,1000);