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: Wood was born in Cedar Rapids, Iowa, on January 28, 1981, the second of three children born to Debbie (née Krause) and Warren Wood, who operated a delicatessen together
Example Output: January 28, 1981

Example Input: Wright was born April 8, 1966, in Dallas to Gayle, a cosmetics saleswoman for Mary Kay, and Fred Wright, a pharmaceutical company employee
Example Output: April 8, 1966

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