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: 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: Lambert was born March 29, 1957, in Great Neck, New York, the son of Yolande Agnès Henriette (née de Caritat de Peruzzis;  1928) and Georges Lambert-Lamond (1910–2003), a French diplomat then at the United Nations
Example Output: March 29, 1957

Example Input: Gandolfini was born in Westwood, New Jersey on September 18, 1961
Example Output:
September 18, 1961