For anyone else having this problem, you can patch it by adding and (player.surface.planet)
before then
on line 17 of whatTimeIsIt.lua
.
It'll falsely show "SPACE!" as the location for any non-planet surface, but at least it won't crash.
there is a fork of this mod which i have been using and i presume it does a variant of that fix because i didnt want to edit the file my self, especially in multiplayer games when i would have to otherwise tell everyone to replace the mod with my version of it in order to play. where as simply switching it out with a different mod including the bugfix is much easier.