"Official" time for other planets I want to make clock that shows current time on different solar bodies. For that I need to know how to count time on those planets. Is there any official definition of times on other planets in our solar system? Brief google search did not help.

I am capable of implementing library for this myself but I wonder about current state of the art of time telling on other planets. So basically I want to know these things:


Is there any official time standard?
If so, where can I find it?
If not, how should I approach this problem? Should I make something like Unix epoch at some time in the past for every planet?


Thanks for any tips.

EDIT: Ok, so on Mars, seconds, minutes and hours were made longer to keep 24-hour day. Is this viable to other planets as well? Venus aside for now :)

I was also thinking about keeping the hours the same, having days as long as many whole hours fits in them plus smaller compensation hours which would have length of (total_minutes_in_solar_day % 60). This concept is from David Weber novels, if you are familiar with them.

EDIT2: Based on discussion in the comments, I'll try to make some basic model that would be if possible applicable to any planetary body (thinking ahead :)). This is obviously not going to have any serious real world application but I would still like it to have some sense.

Thanks for your input, I will leave the question open for some more time if anyone wants to add their opinion.
Time on Mars is measured in sols.

Venus could be a little trickier, depending on your application.

I'm not aware of any timekeeping system for any other planets. There hasn't been a need for one yet. So, again depending on your application, you could come up with various different possible schemes.



Speculation (based on the OP's input regarding application):


Mercury - because of the length of the day, I doubt would-be colonists would measure time in days. They would probably use Earth time (because of communications) and also keep track of Mercury years.
Jupiter, Saturn, Uranus, Neptune - no colonization, no timekeeping