I would like to suggest to add "created month or created quarter" as options for time based sorting of records.

Example:

I would like to create a report that would show me a record count with number of leads created month by month.

In that way i could easily see if the number of leads created in my organisation is increasing or decreasing month by month.

The same with contacts, potentials etc....

Currently i can only sort based in "created time".

Kind regards, 

Bo Thygesen