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: Jordana Brewster was born in Panama City, Panama, on April 26, 1980, the older of two daughters
Example Output: April 26, 1980

Example Input: McKellen was born on 25 May 1939 in Burnley, Lancashire, the son of Margery Lois (née Sutcliffe) and Denis Murray McKellen
Example Output: 25 May 1939

Example Input: Hoffman was born on July 23, 1967, in the Rochester suburb of Fairport, New York
Example Output:
July 23, 1967