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: Basinger was born in Athens, Georgia, on December 8, 1953
Example solution: December 8, 1953
Example explanation: The output is correct as it is a valid text span, is of minimal length and is the correct date of birth.

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

Solution: 25 May 1964