You might think that AD time sync in your organisation is something that just works out of the box but Sander Berkouwer has just done a post about what you need to do to setup time sync for Windows Server 2008 & R2. Apparently the default time sync server for Windows Server 2003 (time.windows.com) no long works so you need to make sure that you DC are configured with a valid time source.
Check out the whole article here The things that are better left unspoken : Active Directory Time Sync (broken by default)
Tip: One of the steps in the article is to configure the time server using the â€œw32timâ€ command on your PDC emulator. You can do this via Group Policy Preferences using the scheduled task option and then use Item-Level Targeting to only apply the command to the computer name of your PDC Emulator. By scheduling this command on a regular basis you can ensure that the time zone list of the server gets refreshed to the proper values periodically.