[quotes-plus] Using a past date in a scan

[orrincsjr]

I want to execute a scan as of a particular date in the past, for 
example uly 7, 2006.  I know that I can somehow calculate the number of 
days back from today (whatever today is) and use it in the scan.  But 
tomorrow I would have to change the scan with another "number of days" 
back.  Is there a way to reference a specific date in a scan?