There are several dates you need to know
- Advance Review Deadline: 4 months ahead of your Publication Date
- Street Date: When you have actual books in hand and you can sell them privately
- Pub Date/Publication Date/Release Date: The date when the industry can start selling you book
Copyright Date: The date when you officially send your book to the Library of Congress. Make sure you are not sending it ahead of having your book published. Libraries and other buyers look at that date to determine the book's age. So if you finished writing your book in December of 2011, finished your editing and layout in June, and set your publication date for November 2012 -- you would set your copyright year as 2013 and NOT 2011. Why? Buyers look at the book's copyright year when deciding one title over another. In January of 2013 with a copyright year of 2011, your book would appear two years old if you set your copyright as the date you finished writing.