25 years from now we could be dealing with an issue similar to the Y2K issue,Β year 2038 problem.
This problem was brought to my attention by Β user 'Ken' commenting on the countdown tool page on this site. Basically *nix systems keep time in 32-bit integer formats counting seconds since Jan. 1, 1970. On Jan. 19, 2038 the 32-bit integer will overflow, resetting to 0 and many systems may interpret that as year 1901.
Certainly a vexing issue, but one with some time remaining to resolve. Even better, some of us will either be retired or simply no longer around to worry about it at all.
A number of fixes and workarounds have been proposed, chiefly among them using a 64-bit integer to keep time. That will do quite nicely and we won't have to worry about the rollover issue for some 292 billions years π