Scheduling HR audit trails...

 We created the audit groups/tables that we need.  And we've written reports to replace person_id with

employee_number, e.g. to make this data useful to end users,  But how does ones schedule the gathering

of this data?  Say I want to review changes over the last three weeks -- when I submit the audit report

CC request [via the front-end tool] how do I submit a start data as 3 weeks ago -- meaning I want audit

gathered for the last 3 weeks?  I have been able to figure this out...