Years ago (circa 1996-1997 maybe?) I ran a MS-DOS program that showed a map of the whole earth, updated once a minute with the time, timezones, and light/dark areas of the planet, taking up the whole screen. I ran it on a spare 286 I had lying around. I think I might have even gotten the idea/program from an article on the internet.
It was a very cool program with a few different configuration options, and I think it was either free, or shareware, available on the internet. For the life of me I can't remember the name of it. It was something like World Clock or Free World Clock or something like that, but that's just a bit generic of a name for Google searches.
Can anyone identify this program?