How do I archive cards that were due more than a month ago?

[Lukasz]

I have a board which I use as a team calendar. I am using start and due dates to display items in timeline view. Items are essentially time bookings, so we do not track if they are completed or not - once the due date has passed, the item is done. I want to keep visibility of items over the past month or so.

I want to remove clutter by automatically archiving cards once their due date is more than one month ago, regardless of if it is marked as completed or not. I cannot find the right search operator for this. 

Bonus points for a Butler routine to run, say, weekly and do it for me.

Thanks!!

[Lukasz · Accepted solution]

As soon as I posted this question, I saw a post in the "related content" on the right hand bar that led me to a solution. 

I found appropriate automation in its own "Due Date" category on the Automation menu.