In early 2009, Spielberg shot the first film in a planned trilogy of motion capture films based on The Adventures of Tintin, written by Belgian artist Herge, with Peter Jackson. The Adventures of Tintin: The Secret of the Unicorn, was not released until October 2011, due to the complexity of the computer animation involved. The world premiere took place on October 22, 2011 in Brussels, Belgium. The film was released in North American theaters on December 21, 2011, in Digital 3D and IMAX. It received generally positive reviews from critics, and grossed over $373 million worldwide. The Adventures of Tintin won the award for Best Animated Feature Film at the Golden Globe Awards that year. It is the first non-Pixar film to win the award since the category was first introduced. Jackson has been announced to direct the second film.

Answer this question, if possible (if impossible, reply "unanswerable"): When was Adventures of Tintin released in the US?
December 21, 2011