How to configure Windows Time Service (W32Time) to point to an external time source?

Issue

Need to set Windows 2003 so that the time will be synchronized with a Kerberos server. The W32Time service is what manages the time synchronization for Active  Directory domains. Hosts in a domain look to the PDC emulator for  time synchronization. By default, Windows is looking to the CMOS clock  to get it's time. To ensure that the clocks on your machines are more accurate  in terms of absolute (and not just relative) time, you can sync the PDC  Emulator in your forest root domain to one of the reliable time servers  available on the Internet.