Discussion on: How To Create A Timer With React

[Raí B. Toffoletto]

Yes good point! But as far I remember it deviates very irregularly in the milliseconds, so I tend to ignore it unless it's crucial 😅. But thanks for the video link, I'll watch it to refresh my memory on the subject 😁.

In that case only one useEffect is needed:

useEffect(() => {
    const intervalId = setInterval(() => {
      setTimespan(new Date(deadline) - Date.now());
    }, interval);

    return () => {
      clearInterval(intervalId);
    };
  }, [deadline, interval]);