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'.

Emmanuelle Grey Rossum was born on September 12, 1986, in New York City
September 12, 1986

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

Edward Harrison Norton was born into a progressive Episcopalian family in Boston, Massachusetts, on August 18, 1969

August 18, 1969