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: Toni Collett was born on 1 November 1972, the eldest of three children; she has two younger brothers

SOLUTION: 1 November 1972

PROBLEM: She was born on August 10, 1972, in Highland Park, Texas, the daughter of Daphne Demar (née Caravageli) and Lawrence Paul "Larry" Harmon, a hospital information network executive in Dallas, Texas

SOLUTION: August 10, 1972

PROBLEM: Christian Charles Philip Bale was born on 30 January 1974 in Haverfordwest, Pembrokeshire, to English parents—Jenny James, a circus performer, and David Bale, an entrepreneur and activist

SOLUTION:
30 January 1974