To find out how long the NT workstation or server service has been running, issue the following from the command-line:

net statistics workstation | more

net statistics server | more

The more filter is required since the time is displayed first and then a lot of other statistics which scroll the screen. This is equivalent to how long the box has been up unless the particular service has been stopped. If the times match for workstation and server service, you got it.

The NT Server Resource Kit utility, srvinfo will display total uptime as one of its options. When you run srvingo, the output will look something like this:

C:\>srvinfo 
Server Name: NTSERVER 
Security: Users 
NT Type: WinNT Server 
Version: 4.0, Build = 1381, CSD = Service Pack 4, RC 1.99 
Domain: DOMAIN1 
PDC: \\NTSERVER 
IP Address: 192.168.1.200 
CPU[0]: x86 Family 6 Model 3 Stepping 3 
Hotfixes: [Q147222]: 
Drive: [FileSys] [Size] [Free] 
Services: 
[Stopped] Alerter

The command line switches for srvinfo are:

 -ns: Do NOT show any service information. 
  -d: Show service drivers and service.
  -v: Get version info for Exchange and SQL.
  -s: Show shares.

Mark Russinovich's freeware utility PSUpTime will display uptime also.