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'.

[EX Q]: Kristen Jaymes Stewart was born on April 9, 1990, in Los Angeles, California, to entertainment industry workers
[EX A]: April 9, 1990

[EX Q]: Tweed was born on March 10, 1957 in Placentia, Newfoundland
[EX A]: March 10, 1957

[EX Q]: 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
[EX A]:
2 July 1990