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But how would the corporate world divide the 13 month year into quarters? Don't you know what that'll do to the bottom line?! Think of the poor shareholders! /s
We dine on the rich during month 13.
The solution to that is having 12 months of 4 weeks each, and one week of solstice every 3 months. One quarter then is 13 weeks in total. That makes it so each quarter perfectly matches a season and keeps it all in sync with solar time. In the ideal case you also match the school holidays to the solstice, and the winter solstice includes new year's day and leap day, making it just a bit longer for Christmas holidays.
Yes, I've given this a bit too much thought.
I'd put leap day with the Summer Solstice, split up the extra days.
3 months and one week. Simples!
Kodak used this calendar for 60 years. The company's decline started within a decade of abandoning the calendar.
3 months 1 week?
Split it to 3 months as is now, then the remainder is 28 days. 28 is divisible by 4 to leave 7.
Q1 ends 1 week into April, Q2 ends 2 weeks into June, etc.