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:
Turner_Classic_Movies

Context:
The film library of Turner Entertainment would serve as the base form of programming for TCM upon the network's launch. Before the creation of Turner Classic Movies, films from Turner's library of movies aired on the Turner Broadcasting System's advertiser-supported cable network TNT – along with colorized versions of black-and-white classics such as The Maltese Falcon. After the library was acquired, MGM/UA signed a deal with Turner to continue distributing the pre-May 1986 MGM and to begin distributing the pre-1950 Warner Bros. film libraries for video release (the rest of the library went to Turner Home Entertainment).

Question:
The MGM/UA-Turner deal concerned MGM films released prior to what date?

May 1986