Comment 2 for bug 1036604

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C de-Avillez (hggdh2) wrote :

Thank you for opening this bug and helping make Ubuntu better.

This is not a bug: '--iso-8601' was deprecated and removed from documentation in 2005; at the time coreutils was unable to correctly parse ISO 8601 dates (meaning it could output it, but could not parse an ISO 8601 date as input). This option was reinstated in 2011 (coreutils 8.15), after some changes that made parsing of ISO 8601 dates possible.

12.04 runs coreutils 8.13. As such, there is no documentation about '--iso-8601' or '-I', as explained above. Closing invalid, working as designed.