Y2K

[Matthew Crews]

>How many bits that are used for time has little to do with how many bits
> the processor has.  There is still plenty of software that has their
> time hard coded to use 32bits even if it's running on a 64bit processor.
> It's seems like it's not so much the desktops and servers we have to
> worry about, but all the 32 bit embedded systems, old file formats and
> things like buildings and cars that tend to get stuck with whatever they
> were deployed with, that are going to hurt us.
>
>https://lwn.net/Articles/717076/
>

Pretty much this. But one can hope that in the time between now and 2038 many of these embedded devices and systems will fail and will need to be replaced, and the replacements will actually be a proper replacement.