The current system date can be retrieved using one of two function calls
date () returns the current date of the computer
now () returns the current date and time of the computer
bear in mind that its the date (and time) of the computer which is running the code not a single central source, as you would in a clent server db. This can be an issue if your networked computers are not regularly synchronising time or if you have computers on a network with different time zone setings
To add n days to a date use the dateadd function. Access comes with a fairly comprehensive range if functions for manipulating temporal data.
I'd rather be riding on the Tiger 800 or the Norton