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'.

Q: Emily Olivia Leah Blunt was born on 23 February 1983 in the London Borough of Wandsworth, the second of four children born to Joanna, a former actress and teacher, and barrister Oliver Blunt, QC

A: 23 February 1983
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Q: Leonardo Wilhelm DiCaprio was born on November 11, 1974, in Los Angeles, California, the only child of Irmelin (née Indenbirken), a legal secretary, and George DiCaprio, an underground comix writer, publisher, and distributor of comic books

A: November 11, 1974
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Q: Emmanuelle Grey Rossum was born on September 12, 1986, in New York City

A:
September 12, 1986
****