Hi, I'm trying to get the number of unsubscribes in a specific period of time via API. The issue is that I can't get the date when the subscriber became unsubscribed via API. I then created a custom field for subscribers named cancelled_at. With Zapier I created an automation that every time a subscriber became unsubscribed it added the tag cancelled to a subscriber. After that i created automation in ConvertKit to update the custom field cancelled_at to the current date when the tag cancelled is added. I tried using {{ "now" | date: "%d-%m-%Y" }} and {{ "now" | date: "%m-%d-%Y" }} but it does not update the custom field. Any ideas why? Or is there a simpler way to get unsubscribes from a specific period of time?