This. Sunday is part of the weekend, not the weekstart.

Depends, mine starts on Monday. I also live in SI and ISO. My wife’s starts on Sunday, she goes to church. Although I still don’t get that as the seventh day was a rest day. 

It does sometimes make talking about Sunday next week confusing.

What do people that start the week on sunday call the "weekend"? For them only Saturday is the weekend and Sunday is the weekstart or what?

It depends on the country. While most countries start it in Monday, Sunday is also common, some muslim countries start it on Saturday, and Maldives starts the week on Fridays.

    february 2027   
mo tu we th fr sa su
 1  2  3  4  5  6  7
 8  9 10 11 12 13 14
15 16 17 18 19 20 21
22 23 24 25 26 27 28 

I wish this is how we arranged it. Makes so much more sense

Alas, my brain is too used to wed in the middle

feb 2027

I only go by the Linux “cal” command.

The US people. There went "What does the whole planet start their week on? Really? Well in that case we'll pick Sunday".

A bit like what they did for pretty much everything else.

Brazil!

Monday is called "Segunda" wich means "second" and every weekday follows this. So the Nth day of the week is called Nth except weekends

A lot of us, apparently

I always knew starting the week on Sunday was messed up. Thankfully there's an ISO to back me up

https://en.wikipedia.org/wiki/International_Fixed_Calendar

While we're changing the calendar, can we rename September through December so they're not off by two?

Septem, Octo, Novem and Decem are the Latin words for 7, 8, 9 and 10 respectively, but they're actually the 9th, 10th, 11th and 12th months of the year. This is because the Roman calendar was originally only 10 months, but Julius Caesar inserted two new months in the middle, without renaming the last four.

Maybe the oldest tech debt in existence - the calendar was changed in 45 BC.

But then we’d have to deal with that lousy Smarch weather

I live in a blue area but I never agreed that the week starts with Sunday. It's clearly Monday and I dgaf who says otherwise.

There exist only 14 different calendars.

Jan 1= monday, Jan 1 = tuesday, ..., Jan 1= sunday, and again the same 7 combinations for leap years.

There is a difference for hollidays like easter that are based on the moon cycle, but just from the days of the week its only 14.

the first day of the month moves forward one weekday each year except mar-dec on a leap year which moves forward two weekdays

That can't be correct, can it?

They would have a rotating 7 year schedule, but it's messed up by leap years. You have the seven calendars you're thinking of and 1-2 leap year calendars mixed into those 7 years. It would have to be somewhere between 1 in 8 and 1 in 9, wouldn't it?