Naming something that only works on one planet " Universal Coordinated Time" was a mistake.
It doesn't matter till we'll be actually able to settle down on Mars permanently, I guess and differentiating from Mars local time and its time zones will be an issue (and all parties involved in colonization will agree that Airy-0 crater will remain the 0° longitude equivalent as proposed by IAU). Beside, the perspective matters - for people on Earth it can be still UTC, for those on Mars it can be whatever term the…
Why? There's plenty of computers in Mars right now and they use martian time already [0]. It's not as if OpenBSD have invented anything new, they just adapted the OS to existing practices.