On the Data Selection menu, go to the Date Range section. The Entire Range section shows the oldest date and the most recent date for your data set. You will notice that this date range is also shown in the Parameters section just below your chart.
To narrow the dates displayed on your chart, click the radio button next to Select Date Range. Using the input boxes for month (MM), day (DD), and year (YYYY), you can type in a new Start Date and/or End Date. The start and end dates can also be selected using the calendar feature. Changing the start and end date will change what data is displayed in your chart or table.