uutils / uutils/coreutils

date gives wrong RFC 3339 date time format

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U - date
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Rust
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Description

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

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Research direction

Start with the date command's --rfc-3339=seconds handling and compare its output with RFC 3339 section 5.6. Confirm the change by checking that the output uses T between the date and time and is accepted by the Go parser.

Written by the indexing model from the issue text.

Assessment

Tech stack
rust
Domain
cli
Issue type
Bug
Difficulty
2/5
Estimated time
1-3 hours
Activity status
Stale
Clarity
Clearly specified
Newbie friendliness
55/100

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