NET TIME /setsntp:yourdomain.com didn't work
NET TIME /set sntp:yourdomain.com didn't either
NET TIME sntp:yourdomain.com /set either
I was testing on an NT 4.0 system, it has a /set option,
I received domain controller errors when I tried to access a server using
net time stnp:somewebserver.com /set
remember, the client is NOT a member of the domain, but you'd think that a web server could supply the time without using a lot of html! ( that is another option, but it really complicates things)