Sync time

Windows 2000/XP's W32Time Service

The following example will make ntp1.example.local and ntp2.example.local our two synchronization sources (the quotes are only required when you have more than one server in your list).

net time /setsntp:"ntp1.example.local ntp2.example.local"

Now we need to start the "Windows Time" (W32Time) service. Open a command prompt (Click Start, then Run, type "cmd" and click ok.) and issue the following command:

net start "windows time"

net time [\\ComputerName] [/querysntp] [/setsntp[:NTPServerList]]
Parameters
file://ComputerName/ : Specifies the name of a server you want to check or with which you want to synchronize.
/set : Synchronizes the computer's clock with the time on the specified computer or domain.
/setsntp[:NTPServerList] : Specifies a list of NTP time servers to be used by the local computer. The list can contain IP addresses or DNS names, separated by spaces. If you use multiple time servers, you must enclose the list in quotation marks.

Check the list of time servers here
http://ntp.isc.org/bin/view/Servers/NTPPoolServers




Sync Time on Linux
# rdate -s time.nist.gov