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If you have Add Books configured to get metadata from the book format file then I'm pretty sure if a file a doesn't have a published date in its metadata then calibre will leave the pubdate/Published column empty.
Don't confuse calibre's date/Date column with DC's date element. The calibre Date column is initially set to the date/time the book was added to the library, in the opf it is written to the element calibre:timestamp. The pubdate/Published value is written into the dc:date element.
BR
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