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Windows 2003 & XP

Stop the Windows Time service

net stop w32time

Force a resync

w32tm /resync

Set the time source

net time /setsntp:<Time_Source>

View the current time source

net time /querysntp


Note: In most cases you dont need to stop the w32time service anymore.



Windows 2008 Server

Stop the W32Time service:

net stop w32time

Configure the external time sources:

w32tm /config /syncfromflags:manual /manualpeerlist:”0.pool.ntp.org, 1.pool.ntp.org, 2.pool.ntp.org”

Make your PDC a reliable time source for the clients:

w32tm /config /reliable:yes

Start the w32time service:

net start w32time

The windows time service should begin synchronizing the time.

Check the external NTP servers in the time configuration by typing:

w32tm /query /configuration



Reference

http://defaultreasoning.wordpress.com/2009/11/16/synchronize-time-with-external-ntp-server-on-windows-server-2008-r2/