Given a short bio of a person, find the minimal text span containing the date of birth of the person. The output must be the minimal text span that contains the birth date, month and year as long as they are present. For instance, given a bio like 'I was born on 27th of Decemeber 1990, and graduated high school on 23rd October 2008.' the output should be '27th of December 1990'.

Q: Cook was born in 1903 in San Francisco, California, the son of Elisha Vanslyck Cook Sr

A: 1903
****
Q: Martin was born on August 14, 1945 in Waco, Texas, the son of Mary Lee (nee Stewart; 19132002) and Glenn Vernon Martin (19141997), a real estate salesman and aspiring actor

A: August 14, 1945
****
Q: Rampling was born in 1946 in Sturmer, Essex, the daughter of Isabel Anne (nee Gurteen; 19182001), a painter, and Godfrey Rampling (19092009), an Olympic gold medallist and British Army officer

A:
1946
****