TASK DEFINITION: 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'.
PROBLEM: Emily Olivia Leah Blunt was born on 23 February 1983 in the London Borough of Wandsworth, the second of four children born to Joanna, a former actress and teacher, and barrister Oliver Blunt, QC

SOLUTION: 23 February 1983

PROBLEM: Catherine Zeta-Jones was born on 25 September 1969 in Swansea, Wales, to David Jones, the owner of a sweet factory, and his wife Patricia (nee Fair), a seamstress

SOLUTION: 25 September 1969

PROBLEM: Benjamin Geza Affleck-Boldt was born on August 15, 1972, in Berkeley, California

SOLUTION:
August 15, 1972