How to create a live running smart list for inactive users?

Hey all,

I'm trying to have a live smart list that looks for people who have been inactive in the past 180 days. Here's the gist of my list:

The problem I have is that the list pulls people who have been created in the past day, or within 180 days. Is there a way I can add a "Lead was Created" filter that contains "on or before 180 days"? I'm getting an error saying it needs to be in dd/mm/yyyy format.

Thanks!