date gives wrong RFC 3339 date time format

[hadmut]

Hi,

I just stumbled accross the problem that the Go runtime library does not accept the output of

date --rfc-3339=seconds

2025-12-14 01:03:46+02:00

on Kubuntu 25.10, as RFC3339 time format with it's parser. I first thought it was an error in the Go runtime library, but in fact

https://datatracker.ietf.org/doc/html/rfc3339#section-5.6

defines

date-time = full-date "T" full-time

i.e. a T instead of a space between Date and Time. So Go is right, this is not correct.

regards

[collinfunk]

https://datatracker.ietf.org/doc/html/rfc3339#section-5.6
defines
date-time = full-date "T" full-time

That is the definition of ISO 8601 given in RFC 3339. Here is the preceding paragraph:

The following profile of ISO 8601 [ISO8601] dates SHOULD be used in new protocols on the Internet. This is specified using the syntax description notation defined in [ABNF].

Here is the subsequent paragraph detailing that RFC 3339 allows a space instead of a "T":

NOTE: ISO 8601 defines date and time separated by "T". Applications using this syntax may choose, for the sake of readability, to specify a full-date and full-time separated by (say) a space character.