Not true, I picked a random revision of the Wikipedia article from October 2022, and it already had the part about 1875:
ISO 8601:2004 fixes a reference calendar date to the Gregorian calendar of 20 May 1875 as the date the Convention du Mètre (Metre Convention) was signed in Paris (the explicit reference date was removed in ISO 8601-1:2019).
I’m pretty sure this has been in the Wikipedia article for even longer, considering that it dates back to 2001. I’m just too lazy to go through the entire history and check when it was added. But definitely not 2 days ago.
That doesn’t mention 1875. Wikipedia was edited two days ago to add that in, it doesn’t appear in the original standard at all.
https://www.iso.org/obp/ui/en/#iso:std:iso:8601:ed-3:v1:en
Not true, I picked a random revision of the Wikipedia article from October 2022, and it already had the part about 1875:
https://en.wikipedia.org/w/index.php?title=ISO_8601&oldid=1118165613
I’m pretty sure this has been in the Wikipedia article for even longer, considering that it dates back to 2001. I’m just too lazy to go through the entire history and check when it was added. But definitely not 2 days ago.
Edit: I also just googled “ISO 8601 2004”, found this PDF: https://dotat.at/tmp/ISO_8601-2004_E.pdf
Under 3.2.1 “The Gregorian calendar” it says:
The Wikipedia article is correct, this wasn’t added 2 days ago, and I don’t know why you’re spreading misinformation.
Another edit: A brief look at your profile explains everything…
Yet another edit: I checked the Wiki article using WikiBlame:
The part about 1875 was added to the article in 2004. Not 2 days ago. This is a blatant lie.
https://en.wikipedia.org/w/index.php?title=ISO_8601&oldid=4668168