I'm on my phone right now so I didn't do a search to see if this idea was already proposed. Here it is:
Personally, I think it would be useful to have some sort of profile widget or a small dedicated area which displays the current time for the user. With so many of us from different parts of the world it would be nice to see what time it is where the user is.
For example, if it's 5 pm at your place and you want to ask someone a question, you can see the time where the person lives and judge if you can get a quick response.
It's kind of hard to explain but I think it might be useful. Please elaborate more on how knowing someone else's time would be useful.