NET TIME \\servertosynchwith /SET /YES to get the date/time of the workstation which the user is using to logon, get synched up with the account domain controller. We have a satellite link to get our network time signal for the domain controllers. This can be achieved many ways using time servers on the Internet or governmental dial-up time servers.
NT clients will make the appropriate time zone adjustments if the time server is in a different time zone. Unfortunately Win95 clients don't recognize time zones making it imperative that win95 clients get their time set by servers in the same time zone.
This is a issue even within a local LAN environment because many administrators are careless about setting the correct timezone.
See TimeServ NT Resource Kit Uility set PC clock to within 10 milliseconds for setting server time.