The tutorial How to Set a QlikView Variable to a Specific Value Using Filters is correct but related to NPrinting 16.* ord older versions. This feature is not yet available in NPrinting 17.*.
If you are using NPritning 17 you can create a filter like the one you can see in the attache image:
- add the field "Year", set Evaluate value from the drop down menu and insert the formula =year(now()) (adapt the formula to your needs)
- add the field "Month", set Evaluate value from the drop down menu and insert the formula =month(now())
- add more "Month" evaluate values with formulas =month(now())-1, =month(now())-2, ... =month(now())-11
The selection on the Year keep only records related to the current year so months from previous year are not selected.
I hope this helps.