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: Yelchin was born on March 11, 1989, in Leningrad, Russian SFSR, Soviet Union (now Saint Petersburg, Russia)

SOLUTION: March 11, 1989

PROBLEM: Arnold Alois Schwarzenegger was born in Thal, Austria on July 30, 1947, the second son of Gustav Schwarzenegger and his wife, Aurelia (née Jadrny)

SOLUTION: July 30, 1947

PROBLEM: Clooney was born on May 6, 1961 in Lexington, Kentucky

SOLUTION:
May 6, 1961