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Just to clarify: calibre uses a custom field in EPUB files for the calibre date. The reason for that is simple. I want people to be able to save to disk and re-add and not lose the date information.
Since it is a custom field, no book that has not come from calibre will have it. SO if you get a book from a friends calibre install, the date will probably be set in the book. But if you download the book from say Project Gutenberg, it wont.
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