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: Yelchin was born on March 11, 1989, in Leningrad, Russian SFSR, Soviet Union (now Saint Petersburg, Russia)
Example Output: March 11, 1989

Example Input: Fassbender was born in Heidelberg on 2 April 1977, the son of Northern Irish mother Adele (from Larne) and German father Josef Fassbender
Example Output: 2 April 1977

Example Input: Selma Blair Beitner was born on June 23, 1972, in Southfield, Michigan, a suburb of Detroit
Example Output:
June 23, 1972

