Weeks aren't subdivisions of months, they are completely independent of months and years. There is good reason for this. Having months alternate between long a

Weeks aren't subdivisions of months, they are completely independent of months and years. There is good reason for this. Having months alternate between long and short (as they typically do) is a lot better than just having one short month. It would get weird with things like rent payments if you have one month that is way shorter than the others. (although I do wish they chose a 30 day month to occasionally add a 31st day for leap year) And I'm not sure we'd be better off with time done with multiples of ten rather than highly composite numbers like 24 and 60. Obviously our system is far from perfect, but it's not all that surprising it is the way it is. Except for leap seconds. Leap seconds are just stupid. Far better to make adjustments like that much more rarely.