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'.

Paul Edward Valentine Giamatti was born June 6, 1967, in New Haven, Connecticut, the youngest of three children
June 6, 1967

Aniston was born on February 11, 1969, in the Sherman Oaks neighborhood of Los Angeles to Greek-born actor John Aniston and actress Nancy Dow
February 11, 1969

Ice Cube was born on June 15, 1969, in Los Angeles, to Doris, a hospital clerk and custodian, and Hosea Jackson, a machinist and UCLA groundskeeper

June 15, 1969