def _parse_birth_date(self, player_info):
birth_date = player_info('<STR_LIT>').attr('<STR_LIT>')<EOL>setattr(self, '<STR_LIT>', birth_date)<EOL>
Parse the player's birth date.

Parse the player's birth date which is embedded in an attribute in
their birth tag on the HTML page.

Parameters
----------
player_info : PyQuery object
    A PyQuery object containing the HTML from the player's stats page.