Things that don't make much sense, but are hard to change now.

In My Humble Opinion
101

[QUOTE=Hilarity N. Suze]
But then there would either be no Friday the 13th, or there would be one every month. (You seem to have started on Saturday, if the 22nd is on a Friday.)
[/QUOTE]

Also, your birthday would always be on the same day, which would probably suck.

102

All this talk about calendars brings up clocks. Specially, why can’t we all be on the same clock? Why can’t it be 1 to 24 o’clock everywhere at the same time?

103

[QUOTE=Annie-Xmas]
All this talk about calendars brings up clocks. Specially, why can’t we all be on the same clock? Why can’t it be 1 to 24 o’clock everywhere at the same time?
[/QUOTE]

Because we don’t want the terminator between calendar days to fall somewhere during the middle of a solar day. It’s convenient to have that happen when most people are asleep or at least in a period of lower or non-essential activity.