Currently only relative time for a comment is shown, e.g., “2 months ago.”
Adding the actual date/time stamp (maybe as a hover?) would be really helpful when comments need to be correlated with events outside of the Figma file (e.g., before or after that review meeting? in Q2 or in Q3? etc.)
This was previously requested Comment feature time and date but the request was closed on Jan 14 2022.