The date also applies only to ordinary books which are defined:
“The term “ordinary book” in this context means one that is published on cardboard or paper printed by conventional methods and intended to be read. It excludes children’s books that have plastic, metal or electronic parts.”
So books with staple bindings, plastic covers, or those "make a sound" things are all verboten because they are not defined as "ordinary books."
You can see a longer explanation of what types of books are banned here, on this book industry blog:
http://bookshopblog.com/2009/02/14/cpsia-book-banning-in-the-guise-of-safety/It includes links to all the original documentation so you can see the quotes in context.