And a fascinating bit of history. I can never remember which months have thirty days and which have thirty-one. But I do know that February has twenty-eight (usually).
Long before the current debate over Daylight Saving Time, a League of Nations proposal for a revised global calendar sparked the ?Battle for the Sabbath.?
There was also the World Calendar https://en.wikipedia.org/wiki/World_Calendar, a proposal for a 12 month year that had similar regularities. Each quarter was laid out the same, with a 30-day month, a 31-day month, and a 30-day month. But it played similar tricks with the days of the week.