instruction:
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'.
question:
Harrison Ford was born at the Swedish Covenant Hospital in Chicago, Illinois, on July 13, 1942, to former radio actress Dorothy (née Nidelman) and advertising executive and former actor John William "Christopher" Ford
answer:
July 13, 1942


question:
Walter Bruce Willis was born in Idar-Oberstein, West Germany, on March 19, 1955
answer:
March 19, 1955


question:
Thomas Jacob Black was born in Santa Monica, California, on August 28, 1969, the son of satellite engineers Thomas William Black and Judith Love Cohen
answer:

August 28, 1969