What happened to my Date and Time?

[Norm]

Seem to have lost my Date and Time from my system preferences on my
1.67/G4 Notebook running 10.5.8. Any ideas where it went or how I get it
back? I have the 10.5.1 install disk. Would I have to do a clean install and
then update to 10.5.8?

Thanks,

Norm