Steve, I looked around and found nothing on it. I'm sure it can be done, but I don't know of anyone who has wanted to do this before. All, I know is, you could install executables on each workstation. Make sure the server can "see" the drive that the executable is on. Write the server application to execute the other programs and thats it! You can exectute other exe's by using the shell() function. Other than that, its just a matter of locating the right API and translating it from C documentation to Basic language. You will probably find the Date and time dialog box in any one of these libraries:

Kernel32.dll
User32.dll
Comdlg32.dll
LZ32.dll
Version.dll

I recommend you go sit down at barnes and noble, find a big ass book on Win32 API and see if you can't find that bad boy.

The reason no one is really going to know is because not many people are going to want to control the time on other PCs.

Hope that helps a little,
Phil