[pmontra]

It makes sense that moon dates are in sync with Earth, after all its motion is in sync with Earth too. Mars days are slightly longer than Earth's ones but there are more of them in a Martian year. You want months and years to be local if there are seasons that affect life on that planet. I expect that Mars will have its own months and years but they'll know Earth date for quite a long time, at least until they'll have to depend on Earth for survival.