The default date range of your analysis is most recent 30 days, but you can change this by clicking on the date range displayed at the top of the screen. This will bring up a calendar view from which you may select the From and To dates you need analyzed. When you are done click on the "OK" button, and your new date range will be displayed at the top of the screen.
Note: Your analysis data will adjust to show trends and activities within the selected date range.
Note: You can also change the timezone in your Project, click this link for more information: Can I change my timezone