BEGIN;

-- Change daynumber starting with 0 on Sunday to ISO 8601 week day numbers.
CREATE OR REPLACE FUNCTION iso8601weekday(integer) RETURNS integer AS '
  BEGIN
    IF $1 = 0 THEN
      RETURN 7;
    ELSE
      RETURN $1;
    END IF;
  END;
' LANGUAGE 'plpgsql';

COMMIT;
