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: Forest Steven Whitaker was born on July 15, 1961, in Longview, Texas, the son of Laura Francis (née Smith), a special education teacher who put herself through college and earned two master's degrees while raising her children, and Forest E
Example Output: July 15, 1961

Example Input: Lange was born in Cloquet, Minnesota, on April 20, 1949
Example Output: April 20, 1949

Example Input: Chan was born on 7 April 1954 in Hong Kong as Chan Kong-sang (Chinese: 陳港生; lit
Example Output:
7 April 1954