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'.

Harris was born on 1 October 1930, in Limerick
1 October 1930

Eastwood was born on May 31, 1930, at Saint Francis Memorial Hospital in San Francisco, California, to Ruth (née Runner; 1909–2006) and Clinton Eastwood (1906–1970)
May 31, 1930,

Damon was born in Cambridge, Massachusetts, on October 8, 1970, the second son of Kent Telfer Damon (1942–2017), a stockbroker, and Nancy Carlsson-Paige.

October 8, 1970