Signed date

The day the data subject indicated consent. For paper workflows, the day the paper form was signed; for witnessed verbal, the day of the verbal indication; for digital, the day of the click-through. MUST NOT be confused with created_at (the digitisation timestamp, which may be days or weeks later in paper-first programs) or effective_date (when the record becomes operative). Field-critical: populate even if the UI only captures created_at.

https://publicschema.org/signed_date