RFC 9557

[vaitkus]

An update of RFC-3339 was recently released in the form of RFC-9557. I am unsure if you are planning to support any of the features presented in this RFC, but it might be worthwhile to at least explicitly specify how your software interprets Z when it appears in RFC timestamps. That is, in RFC-3339, Z is interpreted the same as +00:00 offset (no offset) while RFC-9557 redefines it to mean the same as the -00:00 offset (unknown offset). The claim in the new RFC is that in practice people already often tend to interpret Z as an unknown offset since the use of -00:00 is inconvenient (it is valid in RFC-3339, but not in ISO-8601.