The On Sale Date is the date upon which retailers are allowed to sell your book. You can set this date before your title’s publication date to allow pre-publication sales, however, not all retailers and bookstores recognize an On Sale Date and it can cause problems with the stock status of a title and fulfillment on some websites. The On Sale Date is optional and is not required. If you feel you must have an On Sale Date, we suggest using the same date for the Publication Date and On Sale Date. However, the book will not be available for sale or delivery in the market place UNTIL the on sale date is reached.