You can specify any of the following parameters. If you specify a region, you do not need to specify a date range. If you specify a date range and a region, only reports from that region which fall within the date range will be shown.
If you specify a "Start Date" and don't specify an "End Date", all records through today will be shown.
If you specify an "End Date" and don't specify a "Start Date", records from 1 year before the end-date will be shown.