It's likely a fan-made or unauthorized work, which means there is no official publication date. To determine when it was created, you'd need more information:
* Where did you encounter this title? A website, a bookstore, a friend's recommendation?
* Do you have any details about the author or publisher? This could help track down more information about the book's origins.
Let me know if you can provide more context, and I'll do my best to help you find out more.