https://en.wikipedia.org/wiki/ISO_8601
[D] is the weekday number, from 1 through 7, beginning with Monday and ending with Sunday.
this post was submitted on 09 Feb 2026
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I always knew starting the week on Sunday was messed up. Thankfully there's an ISO to back me up
It also say YYYY-mm-dd should be date and HH:MM:SS should be time and YYYY-mm-ddTHH:MM:SS should be datetime. But it also allow extremely cursed datetime, many prefer rfc3339
But it also allow extremely cursed datetime
Like what?
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.
Dispite growing up in the US, I never actually considered Sunday as the first day of the week. I just saw Saturday and Sunday as margins to the actual week days.
Who the hell starts the week with Sunday?
A lot of us, apparently
of US
I'm not from the US
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
So the last day of the week is actually the first day of the week, and it's also called "second". Nice!
Yeah well, it's called october but I still think of it as the tenth month 😬
I always think of segunda-feira as the first day of the week, despite the name; though it appears that calendars here start on Sunday (something I've never noticed).
While it is the first day of the work week, it makes more sense to think of it as the second day in Portuguese so the naming stays consistent.
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My daughter ripped off part of the February sheet on the calendar. Because it lines up so perfectly, March just auto fills in the ripped bits.
No it's not, this means there's two Friday the thirteenths.
I mean that happens twice in the same year sometimes anyway (2024).
But when February does it, it does mean two consecutive ones.
My FiL gifted me an art calendar from 1998. I was confused at first, then he said the calendar days of 1998 are the same days for 2026. So, that's a thing we all know now!
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.
Never been more proud of my birth month. It did it! February really pulled it off!
Once all the boomers are dead, y'all wanna adopt Symmetry454 or nah?
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