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I was unaware that it cost money. RFC for me (I say like I'd have a clue how to implement any RFC).

ISO8601 is a standard managed by ISO, you can buy a digital or printed copy of the standard from here: https://www.iso.org/standard/70907.html

RFC 3339 is managed by the IETF, and their documents are accessible free of charge.

> you can buy a digital or printed copy of the standard from [the ISO]

Or from your national member body, which for some standards and countries can be substantially cheaper.

In Britain, standards can sometimes be obtained for free via your library subscription (which would be orders of magnitude cheaper than the standards are directly, due to government subsidies for libraries).

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