How to change the time range on the x-axis?

Click on the x-axis and open the Presentation properties tab at the top of the window. In the Label group you can manipulate the scaling of the axis.

The automatic setting will label the scale with the frequency that allows for the best view. Unchecking it will enable you to use the manual step option which lets you specify another frequency for the axis.

For more information:

Time chart

Elements of the chart