Report parameter start week end week

[bastim]

Hi,

I'm trying to use a parameter for start week and for end week, in order to display the data.
For instance I want week 50 to 4 displayed.

I linked the parameter to a formula using the datepart function.
Right now I receive the data from week 4 - 50.
This is just the opposite of the information I need.
I want the add the year as well.
Is there a way to combine both week and year in one parameter? Or is there another solution?

:-V David