What Time is it in London?

Ever find yourself struggling to figure out what time it is in another part of the world?  Perhaps you have friends, family or colleagues who are somewhere besides your home state.  Despite the fact that figuring out time zone changes only involved simple arithmetic, it seems to get the best of us.  But don't worry, even all those super smart people at Google seem to have the same issue, because Google recently unveiled a feature for Gmail that will tell you which contacts should be awake or asleep based on the time-zone they send the email.