Moin!
I use the "teamspeak overlay" in games to get the realtime. Normaly, this tool should display people who are speaking in teamspeak, and give you some other teamspeak informations. But it can show you the time and you fps, too. You can configure it that you only have the clock onscreen, and you can choose the size, color and position of it. It doesn't need teamspeak to run, if you want only the clock and the fps.
http://www.teamspeakoverlay.com/
Matze