On my PRS-300 (and I am sure on the other sonys), the date shown is the book file modification date -- the date the book was last changed on the device. The reader insists on this. If I change the date in the sony DB, the reader changes it back, throwing away all the custom metadata in the process. It might be possible to change both the DB date and the file date, but as I have had incredible amounts of trouble with matching the reader's notion of 'correct dates', I am unwilling to attempt it.
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