Definition: 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'.

Positive Example 1 -
Input: Basinger was born in Athens, Georgia, on December 8, 1953
Output: December 8, 1953

Positive Example 2 -
Input: Keitel was born in New York City, on May 13, 1939, the son of Ashkenazi Jewish immigrants; his mother, Miriam (née Klein), was from Romania, and his father, Harry Keitel, was from Poland
Output: May 13, 1939

Negative Example 1 -
Input: Rachel Anne McAdams was born on November 17, 1978, in London, Ontario, Canada, to nurse Sandra (née Gale) and truck driver Lance McAdams
Output: November 17, 1978, in London

Negative Example 2 -
Input: Weisz was born on 7 March 1970 in Westminster, London, and grew up in Hampstead Garden Suburb
Output: March 1970

Now complete the following example -
Input: Mortensen was born in Watertown, New York, on October 20, 1958, the son of Grace Gamble (née Atkinson; July 8, 1928 – April 25, 2015) and Viggo Peter Mortensen Sr
Output: 


Output: October 20, 1958