If you wanted to keep to the new Postgres standards that they are trying to achieve use the current_timestamp instead of now(). I believe they will be phasing now() out eventually
You can use it as follows for all 7.3.x releases
SELECT current_timestamp + '14 days'::INTERVAL from dual;
Unless current_timestamp is a field in the table dual though you could just do the following
SELECT current_timestamp + '14 days'::INTERVAL;
HTH
