|What operating system are you talking about?|
On Windows server 2003 and 2008 you can use the following commands at a command prompt:
To set or change the source timeserver:
net time /setsntp:"YourTimeServer"
net stop w32time
net start w32time
Or, you can use w32tm, which allows to set much more parameters.
Type w32tm /? to get a list of the available options of w32tm command.
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