[Stratoscope]

Claude's web interface has an elegant solution. When you roll the mouse over one of your prompts, it has the abbreviated date in the row of Retry/Edit/Copy icons, e.g. "Dec 17". Then if you roll the mouse over that date, you get the full date and time, e.g. "Dec 17, 2025, 10:26 AM".

This keeps the UI clean, but makes it easy to get the timestamp when you want it.

Claude's mobile app doesn't have this feature. But there is a simple, logical place to put it. When you long-press one of your prompts, it pops up a menu and one line could be added to it:

  Dec 17, 2025, 10:26 AM [I added this here]
  Copy Message
  Select Text
  Edit

ChatGPT could simply do the same thing for both web and mobile.