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'.

Q: James Harrison Coburn III was born in Laurel, Nebraska on August 31, 1928, the son of James Harrison Coburn II (1902–1975) and Mylet S.

A: August 31, 1928
****
Q: McAvoy was born on 21 April 1979 in Glasgow, to bus-driver-turned-builder James McAvoy Sr

A: 21 April 1979
****
Q: Nicholas Caradoc Hoult was born on 7 December 1989 in Wokingham, Berkshire, to Glenis (née Brown), a piano teacher, and Roger Hoult, a pilot

A:
7 December 1989
****