Calendar Reports allow you to choose any date or day type fields, apply filters and place the results on a calendar screen. For example, you might display a calendar of all the issues that are due this week or this month. Provided you have permission to write to the date field you have chosen for the calendar, you can drag the issues to a new date. Doing so updates the underlying issue. You can also create new issues by double-clicking on the calendar. Double-clicking on a calendar item allows you to edit that item. There are daily, weekly, work-week, monthly and agenda views of the output.
Additional information: http://docs.extraview.com/extraview-23/end-user-guide/reporting/report-types/calendar-reports