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'.

Example Input: Kristen Jaymes Stewart was born on April 9, 1990, in Los Angeles, California, to entertainment industry workers
Example Output: April 9, 1990

Example Input: Widmark was born December 26, 1914 in Sunrise Township, Minnesota, the son of Ethel Mae (née Barr) and Carl Henry Widmark
Example Output: December 26, 1914

Example Input: Sandler was born in Brooklyn, New York, on September 9, 1966, to Judith "Judy" (née Levine), a nursery school teacher, and Stanley Sandler, an electrical engineer
Example Output:
September 9, 1966

