Postgres: Функция форматирования даты

CREATE OR REPLACE FUNCTION info.fx_vdate(timestamp with time zone)
  RETURNS character varying AS
$BODY$
--
BEGIN
  RETURN to_char($1,'YYYY-DD-MM_HH24:MI');
END
--
$BODY$
LANGUAGE 'plpgsql' VOLATILE SECURITY DEFINER
COST 100;