Just set your old/cheap devices to 20th January 2038 and watch what happens (modern stuff should already use 64bit unixtime, but android 4.1 used to have problems for example).
Yep that didnt go well.
Had to relogin to everything in chrome after trying that on my pc

Wonder what would happen if i changed the server time (64 bit system) That controls lots of pcs running 32 bit os in college.
















