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'.

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

Example Input: Damon was born in Cambridge, Massachusetts, on October 8, 1970, the second son of Kent Telfer Damon (1942–2017), a stockbroker, and Nancy Carlsson-Paige.
Example Output: October 8, 1970

Example Input: Lloyd was born on October 22, 1938, in Stamford, Connecticut, the son of Ruth Lloyd (née Lapham; 1896–1984), a singer and sister of San Francisco mayor Roger Lapham, and her lawyer husband Samuel R
Example Output:
October 22, 1938