Is there any reason they should? Unless the Earth were tidally locked to the Sun, I'm not aware of any reason a day would have any relationship to a year.
It would be convenient to not having to deal with leap days and other such constructs. Of course, we cannot choose how these things behave, and therefore using a calendar not aligned to the natural cycles of our planet would be even less convenient, and would only start making sense when humanity develops into an interplanetary civilization.
It would be convenient to not having to deal with leap days and other such constructs. Of course, we cannot choose how these things behave, and therefore using a calendar not aligned to the natural cycles of our planet would be even less convenient, and would only start making sense when humanity develops into an interplanetary civilization.