>in the LAN environment, is there a way to know the server's datetime()?
>
>My client has an issue, the operator changes the clock so he can enter old invoices.
>My client want to each time the cashiers login, the program will compare the datetime() with the server's datetime()
>
>Thanks for the help
>
>Regards,
>
>Jerry Yang

Instead of using local server, try a web based timeserver. In it's simplest form there might be some Offfset, but this might be no problem on your setting.
An other simpler solution might be to check timestamps on your tables - if something is newer then actual datetime - oops

Anyway the setup is bad, a user - operator - should never own the right to change Date / Time at all. It sounds like he runs as admin - what is known as idiotic for decades. At least I must swap to my admin account to do change something.