Dynamic date filter based on slicer selection

Dear all,

I have a situation where I need to filter the last X days based on a filter that is applied.

If a user chooses for example 15 Feb 2018, I want to show the last X days before 15 Feb 2018.

I was thinking about setting a value to the anchor date in a relative slicer. This however doesn't seem to be possible.

Can this be achieved in Power BI?

Best Regards,

M