Reporting: How to add in "Advanced" (Custom Report) a date format "Weekly"

Reporting: How to add in "Advanced" (Custom Report) a date format "Weekly"

There is only Year, Month, Day, Time, Year-Month and Year-Month-Day.
No Weekly.
But I need to produce a weekly report for Open, On Hold and Closed requests
How can I do it?
                New to ADManager Plus?

                  New to ADSelfService Plus?