20/2/2014 - The QVW has been updated to set the min and max dates to match the date range in the data and to prevent selecting an end date prior to the start date, and some of the action buttons have been revised.
Here is a sample document showing two alternative ways to select date ranges.
By Period - this allows selection of Year & Month
By Date - this allows a start & end date to be entered and selects all dates between.
I hope this is useful.