De net help time
:
NET TIME
[\computername | /DOMAIN[:domainname] | /RTSDOMAIN[:domainname]] [/SET]
NET TIME synchronizes the computer's clock with that of another computer or domain, or displays the time for a computer or domain. When used without options on a Windows Server domain, it displays the current date and time at the computer designated as the time server for the domain.
\computername
— Is the name of the computer you want to check or synchronize with.
/DOMAIN[:domainname]
— Specifies to synchronize the time from the Primary Domain Controller of domainname.
/RTSDOMAIN[:domainname]
— Specifies to synchronize with a Reliable Time Server from domainname.
/SET
— Synchronizes the computer's time with the time on the specified computer or domain.
(Desculpe, é do Windows 7, mas o funcionamento geral e as opções são as mesmas para o XP.)