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'.

Let me give you an example: Basinger was born in Athens, Georgia, on December 8, 1953
The answer to this example can be: December 8, 1953
Here is why: The output is correct as it is a valid text span, is of minimal length and is the correct date of birth.

OK. solve this:
George Hosato Takei was born Hosato Takei on April 20, 1937 in Los Angeles, California, to Japanese-American parents Fumiko Emily Nakamura (born in Sacramento, California) and Takekuma Norman Takei (born in Yamanashi Prefecture), who worked in real estate
Answer:
April 20, 1937