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: Roberts was born on October 28, 1967, in Smyrna, Georgia, a suburb of Atlanta, to Betty Lou Bredemus (1934–2015) and Walter Grady Roberts (1933–1977)
Example Output: October 28, 1967

Example Input: 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
Example Output: June 3, 1925

Example Input: Beckinsale was born on 26 July 1973 in the Chiswick district of London, the only child of actors Richard Beckinsale and Judy Loe
Example Output:
26 July 1973