Sorry if this is an obvious issue I'm completely missing at my end... What's the best way to capture and retain the exact opt-in DateTime? Somehow I'd always thought this was a system field in addition to the "Date added" field. But that doesn't seem to be the case. My lists are all double opt-in and nowhere am I able to capture the date of opt-in confirmation. For GDPR reasons, however, I need to have this field and make it independent of the "Data added" field. "Date added" changes with every list move, export/re-import etc. Yet, the actual opt-in date is nowhere to be found. What's the trick?