Untitled

const currentTime = () => {
  const el = document.querySelector("h1");
  let date = new Date();
  let hh = date.getHours();
  let mm = date.getMinutes();
  let ss = date.getSeconds();
  hh = hh < 10 ? `0${hh}` : hh;
  mm = mm < 10 ? `0${mm}` : mm;
  ss = ss < 10 ? `0${ss}` : ss;
  let time = `${hh}:${mm}:${ss}`;
  el.innerText = time;
};

currentTime();
setInterval(currentTime, 1000);