There are several ways to define the required period.
The first way is to simply enter the required period in the text field provided below:
You can also click on the following button to call up a date selection window:
Now you can simply enter the required period in the two text fields provided at 1 and then click on button 3:
You can also select the date in the date module at 2 and then click on button 3:
Finally, you can select a month by clicking on 1 and then on button 3:
Alternatively, choose a year by clicking on 2 and then on button 3: