There are probably a lot of sites as well as utilities that do this (been using timeanddate.com after being told about it by Han Kern long ago), but since AsenDURE posted it on his blog, I read about it, started using it and I found it nifty, I thought I’ll mention it as well. ;)
Screenshot:
Once all the clocks are set, it just takes 1 click of the EngNet icon in the system tray to pop the details up.
Download: Link