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'.

Philip Anthony Hopkins was born in the Margam suburb of Port Talbot on 31 December 1937, the son of Annie Muriel (née Yeates) and baker Richard Arthur Hopkins
31 December 1937

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

Gandolfini was born in Westwood, New Jersey on September 18, 1961

September 18, 1961

