After British popular author J.K. Rowling revealed the title of the seventh and final book in her wizard saga last December, “Harry Potter and the Deathly Hallows have the official release date. Fans of the series that has already sold an estimated 300 million copies worldwide were waiting for the official release date (July 7, 2007, Saturday) of Harry Potter book.
It was reported that every edition of Harry Potter book was released on Saturday. Probably the main reason for this is to allow the kids to attend the midnight release party without any hassle.