Calendars within reporting can assist in monitoring submissions, start dates, last user access etc.
Within "Administer" click in to the respective tab you wish to report on (eg. Users).
You then click into "Config" which will produce several reporting options.
Click on "Calendar" and a summary of reportable features will appear. (Calendar reporting within Users will show "Created" and "Last Access" data in a calendar format.)
Once created, you can edit the calendar to be based on day, week, or month. All data will update in real time and show on your report.