Not sure how a date/time stamp works on the Kindle but here is the situation on my Sony.
When I copy a pdf library book to my Sony it will pick up the date/time from the device. The book will automatically expire once the 14 or 21 days has been reached. A small work around that someone pointed out allows me to change the date on my reader which will either reduce/extend the library books expiration date. All of this is assuming I don't connect my reader to my pc and open up ADE (it may sync and tell the ebook the correct date).
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