Our system of measuring days, months and years is completely insane. It was drawn up a dozen years before christ’s birth and is basically conjured up at the whim of Ceaser. It makes no sense. The month names are based on god’s and godesses and the days of the week are equally archaic. Check out this article on the origins of the months and days.
I really hope we switch to Metric time at some point. Star Trek has already brought “Stardate” to the lexicon. As humans, a species that is constantly evolving and pushing the limits of physics and science, we really cling to the deep past. I found this comparison of Metric vs. Decimal time interesting too.