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'.

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
23 February 1983

She was born 17 November 1966 in Paris, the second child of Simone (née Morisset), a shop assistant (d
17 November 1966

McAvoy was born on 21 April 1979 in Glasgow, to bus-driver-turned-builder James McAvoy Sr

21 April 1979