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?
The standard specify a ton features and formats. Thing like day if week so 2015-W4-1 would be the first day of the fourth week of 2015.
But the you have can have periods like "P1Y2M10DT2H30M", and you can specify start and end dates. So if you want to start an event that runs for 3 months, 20 days, and some time you could write it as "20220212T1133/P3M20DT7H15M".
And then there's more like giving the year as an exponent, so 2015 can be written as Y-2.015E3S4.
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.
That's what the country was built on, the right to be as stupid as you want to be.
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
Yeah well, it's called october but I still think of it as the tenth month 😬
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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.
Neat!
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 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.
Weeks start on Mondays
Feb 2027 starts on a Monday, and has 28 days!
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Never been more proud of my birth month. It did it! February really pulled it off!
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