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But for epub3 couldn't calibre just use the official metadata dcterms:modified metadata item since it includes date and time down to the second as to when the file was last modified. That is part of the epub3 spec to update/change that anytime the edited epub3 is written.
Epub2 does not typically include the exact time in its modification date, so it probably can only be used if later than whatever value calibre sets now.
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