Normally, the "Date and Time Properties" dialog has a third tab "Internet Time" where you can turn on/off the use of a time server, or change where it points.

This tab is missing, and Windows is frequently setting itself to the wrong time, which is very frustrating.

How can I confirm what time server is being used, and then either change it to a working one, or simply disable the time synchronization entirely?

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You can use the command line tool w32tm. This tools lets you set the time server as well as the parameters surrounding it. An example, to set the time to use time.windows.com

w32tm /config /manualpeerlist:time.windows.com /syncfromflags:ALL 

Note for most of the parameters you will need to restart the Windows Time Service by running (note the spelling)...

net stop w32time && net start w32time

See full details here: TechNet - w32tm

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If you use w32tm ...options... /update you don't have to manually restart the service with net stop / start – Gerd Klima May 31 '11 at 9:27
While true, I prefer the two-step approach to address any changes to w32tm configuration I want to make before committing. – Theo Jun 4 '11 at 1:41
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Have a look at this article.. http://support.microsoft.com/kb/307897 Relevant for time service for xp.

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