That isn't actually what I'm looking for. For example, last 7 days would bring an open window that looks back to everyone who did an activity in the last 7 days. I want to build a drip campaign series that target people exactly 30 days after they made a purchase. Hope that clarifies.

Thanks for the reply!I tried that too but none of the filters allows me to choose x days/months ago. It is either before or after.