dateconfig is what RH uses.  I would guess mandrake has the same/similar command 
to change/setup the systems date/time.

> Is there any way to adjust this after the initial setup?
> 
> 
>>FYI, I found out why the clock display on Mandrake was running 7 hours
>>behind for me- apparently Mandrake Linux "wants" to display the time as
>>Greenwich Mean Time. Consequently, if your system clock is set to local
>>time, you must indicate at set up that it is set to GMTin order to
>>display local time. If you indicate that your system clock is /not/ set
>>to GMT, the software will make the necessary adjustment based on your
>>locality so that the clock displays GMT anyway.