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'.

Ferrell was born on July 16, 1967 in Irvine, California, to Betty Kay (née Overman; born 1940), a teacher who taught at Old Mill School elementary school and Santa Ana College and Roy Lee Ferrell Jr
July 16, 1967

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

Luke George Evans was born on Easter Sunday, 15 April 1979, in Pontypool, and brought up in Aberbargoed, a small village in the Rhymney Valley, Wales, the only child of Yvonne and David Evans

Sunday, 15 April 1979