Client Timer In Sync?

Hello, I was wondering how I could make the client display a timer gui thats in sync with the server.

I was using using a number value under Replicated Storage and a .Changed event on my client to update the timer but apparently I heard this is a bad practice.

So I decided to do a remote event. For example, when the stage changes, I will fire the client telling them to count down from x amount and have it update the timer.

The issue is, if the client receives the signal late, the timer will be out of sync with the server.

How do other games solve this? Honestly, this seems like a very simple and petty issue but I just cant seem to find a solution to this.

Any help appreciated, thank you.