given this text: "An African Adventure with NAME_1 is a short film on the Gatti-Hallicrafters Expedition to British East Africa in 1947 that is presented by International Harvester of Chicago. The film opens with a shot of members of the expedition on deck of a ship as it sails to South Africa. A man holds a cobra at the Port Elizabeth Snake Gardens to extract its venom. " what is the date in the text?