Can I obtain the time at which a contact unsubscribes from email marketing?

Yes, you can do this with the help of Workflows' Update Fields action.

• First, create a custom field called Unsubscription Date from Settings > Module Management > Module Layouts & Fields.
• Then follow these steps to set up the Update Fields action:

1. Select the Contacts module under Basic Information.
2. Set the Entry Criteria to Email Opt-in has changed to Contact opted out.
3. Create an Update Fields action to update Unsubscription Date to the current date.

The day on which the Email Opt-in field changes to Contact opted out is updated in Unsubscription Date.
To learn more about the Update Fields action, click here.