Atomic Time Synchronization allows you to synchronize Local System Clock with Atomic Clocks around the USA.
You choose your server, select your regional GMT decal and then you can easily do synchronization. Once ATS is set up, you can have it periodically set your system clock; plus it even has a built-in NTP server so you can synchronize all of your other computers quickly and easily! You can even specify a custom time offset to ensure that it sets your clock just the way you like it (I like my clocks 10 minutes fast, so I'm always a bit early).
Atomic TimeSync works on all versions of Windows, from Window 95 to Windows 7 and everything inbetween (including XP, Vista, Win2k, etc).
