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'.

[EX Q]: Walter Bruce Willis was born in Idar-Oberstein, West Germany, on March 19, 1955
[EX A]: March 19, 1955

[EX Q]: Beckinsale was born on 26 July 1973 in the Chiswick district of London, the only child of actors Richard Beckinsale and Judy Loe
[EX A]: 26 July 1973

[EX Q]: Gerard James Butler was born on 13 November 1969 in Paisley, Renfrewshire, Scotland, the youngest of three children of Margaret and Edward Butler, a bookmaker
[EX A]:
13 November 1969