def convertToDate(fmt="%Y-%m-%d"):
        """
        Helper to create a parse action for converting parsed date string to Python datetime.date

        Params -
         - fmt - format to be passed to datetime.strptime (default=C{"%Y-%m-%d"})

        Example::
            date_expr = pyparsing_common.iso8601_date.copy()
            date_expr.setParseAction(pyparsing_common.convertToDate())
            print(date_expr.parseString("1999-12-31"))
        prints::
            [datetime.date(1999, 12, 31)]
        """
        def cvt_fn(s,l,t):
            try:
                return datetime.strptime(t[0], fmt).date()
            except ValueError as ve:
                raise ParseException(s, l, str(ve))
        return cvt_fn

        Helper to create a parse action for converting parsed date string to Python datetime.date

        Params -
         - fmt - format to be passed to datetime.strptime (default=C{"%Y-%m-%d"})

        Example::
            date_expr = pyparsing_common.iso8601_date.copy()
            date_expr.setParseAction(pyparsing_common.convertToDate())
            print(date_expr.parseString("1999-12-31"))
        prints::
            [datetime.date(1999, 12, 31)]
        
src/pkg_resources/_vendor/pyparsing.py