http://longnow.org/about/ "The Long Now Foundation uses five-digit dates, the extra zero is to solve the deca-millennium bug which will come into effect in about 8,000 years."
Based upon human stubbornness, every planet will have it's own time and date system that will be divided based on historically obscure details before/during and after colonization. Stuff like Thursday is essentially "Thor's day" and in German it literally says "day of the thunder" (Donnerstag).
ps.: Thursday is also Jupiter's day, so it will probably prevail on any colony / permanent human station orbiting it/it's moons.
pps.: I hope they get over the stupid imperial vs. metric divide though.. that one is really annoying.
http://longnow.org/about/ "The Long Now Foundation uses five-digit dates, the extra zero is to solve the deca-millennium bug which will come into effect in about 8,000 years."