If it is the factory radio you need to set the clock on then here is the information:
Setting the Clock Press and hold HRS until the correct hour appears. Press and hold MIN until the correct minute appears. You may set the clock with the ignition off if you press RECALL first and follow the same procedure described above
This was taken from the owners manual, which I was able to locate online here:
http://www.vadengmpp.com/owners-manual/buick/1997-Buick-ParkAvenue.pdf
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