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: Edward Harrison Norton was born into a progressive Episcopalian family in Boston, Massachusetts, on August 18, 1969

A: August 18, 1969
****
Q: Margot Elise Robbie was born on 2 July 1990 in Dalby, Queensland, to Doug Robbie, a former farm-owner and sugarcane tycoon, and Sarie Kessler, a physiotherapist

A: 2 July 1990
****
Q: Yelchin was born on March 11, 1989, in Leningrad, Russian SFSR, Soviet Union (now Saint Petersburg, Russia)

A:
March 11, 1989
****