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: Welch was born as Jo Raquel Tejada on September 5, 1940 in Chicago, Illinois
Example Output: September 5, 1940

Example Input: Page was born on February 21, 1987, in Halifax, Nova Scotia, to Martha Philpotts, a teacher, and Dennis Page, a graphic designer
Example Output: February 21, 1987

Example Input: Margot Elise Robbie was born on 2 July 1990 in Dalby, Queensland, to Doug Robbie, a former farm-owner and sugarcane tycoon, and Sarie Kessler, a physiotherapist
Example Output:
2 July 1990

