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This happens because at least two parts of EPUBCheck dislike the ISO8601 timezone format in different ways. In the dc:date context, EPUBCheck is OK with "2020-12-09T14:06:40-07:00" but not with "2020-12-09T14:06:40-0700". The only difference is a colon in the timezone offset of 0700 hours. I learned about this oddity from a PHP manual ...


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