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'.

Tweed was born on March 10, 1957 in Placentia, Newfoundland
March 10, 1957

Cara Jocelyn Delevingne was born on 12 August 1992, in Hammersmith, London, the daughter of Pandora Anne Delevigne (née Stevens) and property developer Charles Hamar Delevingne
12 August 1992

Catherine Elise Blanchett was born on 14 May 1969 in the Ivanhoe suburb of Melbourne

14 May 1969