edf_birthdate_str2vec — Converts the birthdate string into a vector
[birthdate_vec]=edf_birthdate_str2vec(birthdate_string);
Converts the birthdate string into a vector.
birthdate_string - a string which contains a birthdate, which is the output of the function edf_get_birthdate()
birthdate - vector which contains a birthdate (year month day), which can be feeded into the function edf_set_birthdate().