Context: The Lightning Thief was published in June 2005 by Miramax Books, an imprint of Hyperion Books for Children and thus Disney Publishing (succeeded by the Disney Hyperion imprint). The book has sold over 1.2 million copies in the subsequent four years, appearing on The New York Times children's Best Seller list and being listed as one of the Young Adult Library Services Association's Best Books for Young Adults, among other awards. It was adapted into a film named Percy Jackson & the Olympians: The Lightning Thief released in the United States on February 12, 2010. The sequel to this novel is The Sea of Monsters. The book has a rating of 4.22 out of 5 on Goodreads.

Question: when was percy jackson and the lightning thief published?
Steam of consciousness below:
To answer the question, consider the following: The Lightning Thief was published in June 2005 by Miramax Books, an imprint of Hyperion Books for Children and thus Disney Publishing (succeeded by the Disney Hyperion imprint).
So, the answer is June 2005.