How to configure Primary DC to sync time with an external Time Source

This article explains how to configure your Windows Server 2008 R2 Active Directory Primary Domain Controller to synchronize time with an external time source.
Note: In an active directory, all member computers will sync time with the PDC, so you only need to setup an external time source on the PDC.
Open an elevated command prompt and type the following:

Net Stop W32Time
W32tm /config /syncfromflags:manual /manualpeerlist:""
W32tm /config /reliable:yes
Net Start W32Time
W32tm /config /update
W32tm /resync

You can run W32tm /resync on member computers to sync time with the PDC.

A good reliable time source to use is pool.ntp.org.

Check out the NTP Project for world wide time sources.

Also note: from Microsoft:
http://support.microsoft.com/kb/816042

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