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'.

Tony Curtis was born Bernard Schwartz on June 3, 1925, at the Fifth Avenue Hospital corner of East 105th Street in Manhattan, New York City, the first of three boys born to Helen (née Klein) and Emanuel Schwartz
June 3, 1925

Nolte was born on February 8, 1941, in Omaha, Nebraska
February 8, 1941

Steven Allan Spielberg was born on December 18, 1946 in Cincinnati, Ohio

December 18, 1946