>Haw can I get date and time from another computer in net example from dedicated server ?

If you have Internet access and you're running Windows NT or higher, you can use the NET TIME command with the SNTP option, and thereby set your computer's time using the NTP server of your choice.

http://www.microsoft.com/windowsxp/home/using/productdoc/en/default.asp?url=/windowsxp/home/using/productdoc/en/net_time.asp

If I recall correctly, the Windows Time Service must be running to use the SNTP option.

I like to use the U.S. Naval Observatory's NTP time servers, aptly named "tick" and "tock". From a Windows Command window (CMD.EXE):

NET TIME /setsntp:tick.usno.navy.mil
* OR
NET TIME /setsntp:tock.usno.navy.mil