When did Jackie Robinson sign with the Brooklyn Dodgers?

The Dodgers signed Jackie Robinson to a contract after the 1945 season when he hit .387 for the Kansas City Monarchs of the Negro League. Robinson spent one season in AAA ball playing for Montreal and then the Dodgers purchased his contract on April 10, 1947 and brought him up to the major leagues. Robinson's first game in MLB for the Dodgers was April 15, 1947 against the Boston Braves.