EpubCheck Date format and Calibre
The recently announced EpubCheck-1.1 no longer complains about verbose dates like 2010-11-20T11:10:15.564000+00:00. That's the correct ISO9601 format and is compliant with the OPF 2.0 spec.
They've known about this issue since at least Feb 12, 2010. It's fun to think about how long a bug like this would have been allowed to remain in Calibre.
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