Variable to filter range

Hey everybody,

I want to create a variable "VAR_DATE" to filter a range of my dataset, based on the input of the user.

In my example I have a table with three columns:

"date"     "date-36 month"     "comment"

the variable is filtering the column "date". as a result column date should be filtered from the value "date-36 month" like a min to "date" like a max.

I tried to use an If statement within the expression but it didnt work.

I hope somebody can help :-)

Regards