jremington:
Next question: will anyone be using Arduinos in 2038?
It's not an Arduino question. It has been a lurking problem in all UNIX based date storage, and Windows date storage, for ever.
We discovered it back in the late 1990's with Windows NT. There was a bug in the BIOS in some Unisys PCs. Sometimes at midnight, the time would race ahead at a tremendous rate, but would stop with an error when a date in 2038 was reached. I forget the exact date, but sometime in February, I think.
Paul