This article gives a pretty good run-down of where our wonkey calendar comes from. And also how leap-years resulted in the loss of 10 days, which I’ve separately heard caused ‘revolutions’ (or at least wide-spread grumbling) by the populace for their days stolen from them.
It’s bizarre to me that the whole world seems to use the gregorian calendar and 24-hour day, but we can’t agree on daylight savings time, or other measurement units.
