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Modified/last_modified is the date-time that the book metadata was last changed in the database.
Modified and Date will be the same when a book is first added to the database, if you added a tag to the book then the Modified date would be updated to the date-time you did that but Date wouldn't change. You cannot change Modified Date. If you never change Date it should always be the same or earlier than Modified.
I'm not sure what your question is or what you're trying to do ?
BR
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