You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Marvel_Comics

Context:
On August 31, 2009, The Walt Disney Company announced a deal to acquire Marvel Comics' parent corporation, Marvel Entertainment, for $4 billion or $4.2 billion, with Marvel shareholders to receive $30 and 0.745 Disney shares for each share of Marvel they own. As of 2008, Marvel and its major, longtime competitor DC Comics shared over 80% of the American comic-book market. As of September 2010, Marvel switched its bookstores distribution company from Diamond Book Distributors to Hachette Distribution Services.

Question:
When was the sale of Marvel to this entertainment conglomerate announced?

August 31, 2009