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: Mendes was born on March 5, 1974, in Miami, Florida, to Cuban parents Eva Perez Suarez and Juan Carlos Mendez, and was raised by her mother in the Los Angeles neighborhood of Silver Lake, after her parents' divorce
Example Output: March 5, 1974

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

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