Google-chrome – Disable the Google Plus red notification number on Gmail, Google search, etc

Solved (by Alex, see comments above): press ? in Inbox view and enable/disable keyboard shortcuts there.

Certainly if you're receiving email notifications you'll have a timestamp on the email message.

Some of the notifications (depending on what they are) do have a date/time on them. You may need to go to "View all notifications" to see that (or at least click the notification itself).

I think, though, that this isn't practical in G+. Notifications for the same item get rolled up into one notification record. (For instance, I see a notification on a post of mine telling me that three people have +1'd it and one person has shared it. Obviously they didn't all do it at the same precise moment.)