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'.

Wilde was born Olivia Jane Cockburn in New York City on March 10, 1984
March 10, 1984

Thompson was born on May 31, 1961 in Rochester, Minnesota, one of five children of Clifford and Barbara Barry Thompson, a musician
May 31, 1961

Lilly was born in Fort Saskatchewan in Alberta on 3 August 1979

3 August 1979