Yeah, I know in theory that's the case (although I didn't realize how often time zones changed). I still expect there will be problems on that timeline. As for how serious they would be or how much difference an extra year would make, I don't know.
I recently change the subnet my house network runs on. 90% of my devices just switched with DHCP, but there were a couple of laggards. It was a good exercise in figuring out where I had gotten lazy with my setup.
I feel like this would be a good exercise in how we handle clocks. :)
If your time code doesn't already depend on an externally updating time database, you're already doing it wrong.