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: Philip Anthony Hopkins was born in the Margam suburb of Port Talbot on 31 December 1937, the son of Annie Muriel (née Yeates) and baker Richard Arthur Hopkins
Example Output: 31 December 1937

Example Input: George Raymond Stevenson was born in Lisburn on 25 May 1964, the second of three sons born to Irish parents
Example Output: 25 May 1964

Example Input: Leonardo Wilhelm DiCaprio was born on November 11, 1974, in Los Angeles, California, the only child of Irmelin (née Indenbirken), a legal secretary, and George DiCaprio, an underground comix writer, publisher, and distributor of comic books
Example Output:
November 11, 1974