I'm surprised that your server wasn't already configured for the time change. At the beginning of your AUTOEXEC.NCF, it should list your TimeZone info. But if you do have to make adjustments...
Go to the NetWare Console Monitor screen.
Choose SERVER PARAMETERS / TIME
Modify the parameters that you need changed, such as Time Zone, etc...
If you need to make any Time adjustments, you will also do this here.
***Important*** Make sure to use the correct format when making time adjustments, otherwise it won't work. The format is as follows...
[+|-]xx:xx:xx [AT] APRIL 8, 2002 03:00:00 PM
x=time adjustment amount. One hour forward would equate to +01:00:00
Good Luck!