this post was submitted on 11 Jun 2025
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ISO8601 is YYYY-MM-DD nothing to do with weeks and isn;t the only difference of RFC3339 that you can use a space instead of a T in between the date and time? Also RFC3339 is only an internet standard while ISO is a generally international standard?
ISO8601 is much much looser than RFC3339:
https://ijmacd.github.io/rfc3339-iso8601/
Yeah I know, but it also has a different use case. As far as I know RFC3339 is mostly used for programming while ISO8601 is the standard for international communication and I wish people would use it more. I have processed American invoices in the wrong month because of their date structure. I have no reason to it, but I always write my date ISO 8601 (YYYY-MM-DD)
No idea what you based those claims on, but the spec itself (I have the pdf) and Wikipedia's summary disagree. ISO8601 allows for YYY-MM-DD yes but it allows for a bunch of silly stuff.
https://en.m.wikipedia.org/wiki/ISO_8601
Both "2025-W24-4" and "2025‐163" are valid representations of today's date in ISO8601.
(Also the optional timezone makes it utterly useless.)
The omitting of timezones doesn't matter to a vast majority of the world, since most countries only have one time zone so I don't see a reason why that is relevant in most use cases.
ISO is a general standard, it's in the name and the RFC is created for the internet, that is also in the name/description of the RF.
Using 2025-164 can be handy, I actually use the day of the year to check what invoices from previous year are open since those are the invoices that are due 164 days or more.