[ghaff]

There's also the 2038 problem [1] although it apparently is mostly an issue with embedded systems. It's not clear that it's a particularly widespread problem but that's mostly just based on the fact that there doesn't seem to be much discussion about it.

[1] https://en.wikipedia.org/wiki/Year_2038_problem

[spiralx]

There's also the Y2036 problem which is part of Y2038, and other issues in 2028, 2040, 2042, 2048, 2050, 2079, 2080, 2100, 2106, 2108, 2137, 2262, 10,000, 32,768 and 65,536 - although I'm sure by the time we reach the latter end of the list we'll have replaced the affected systems ;)