AV Last Scan within "x" days instead of static date

 

Is it possible to check the last scan was completed in the last 7 days or so instead of after a set date?

 

 

I have this working so far;

 

 

session.detected_av.av_1.last_scan >= "2009.05.29.00.00"

 

 

but I don't want to have to go into the Firepass each week if possible and update this line to ensure scans have been completed more recently.

 

 

Any help anyone can be will be much appreciated.

 

 

cheers,

 

Greg