Do content update notes and dates contribute to E-E-A-T?

Short answer: Yes, when used honestly: an update note and date show both readers and machines that the content is maintained. Refreshing the date without changing the content does the opposite and costs trust.

Correct use

• Real change, visible note: state in a sentence or two what was updated (new regulation, revised recommendation).
• Schema consistency: datePublished and dateModified must match the visible date.
• Author link: the profile of the person who made the update strengthens the experience signal.
• Maintenance cycle: important pages get scheduled reviews; aging information is updated or flagged.

What to avoid

Date changes without content changes, mass fake refreshes, and contradictions between the visible date and the schema date; these patterns damage user and search engine trust alike. The size of the contribution is not fixed; the effect is tracked against the baseline through impressions and positions.