Question: when is the American former Major League Baseball (MLB) outfielder and manager who also replaced Manager Cal Ripken, Sr when fired born

Related documents: [0]  [DOC] The 1988 Baltimore Orioles season was a season in American baseball. It involved the Orioles finishing 7th in the American League East with a record of 54 wins and 107 losses. The season is remembered for the 0-21 start that lasted from April 4 to 28 to start the Orioles season. Manager Cal Ripken, Sr. was fired after an 0-6 start and replaced by Hall of Famer Frank Robinson. The Orioles won their first game of the year against the Chicago White Sox at Comiskey Park on April 29. The most runs allowed during the season was 15 in a game on June 19 while the most runs scored was 12 in a game on May 31. Orioles owner Edward Bennett Williams died in August of that year. [END] 
[1]  [DOC] Frank Robinson (born August 31, 1935) is an American former Major League Baseball (MLB) outfielder and manager. He played for five teams from 1956 to 1976, and became the only player to win league MVP honors in both the National and American Leagues. He won the Triple Crown, was a member of two teams that won the World Series (the 1966 and 1970 Baltimore Orioles), and amassed the fourth-most career home runs at the time of his retirement (he is currently 10th). Robinson was elected to the Baseball Hall of Fame in 1982. [END]  
Answer: August 31, 1935
August 31, 1935