Kenwood KDC-6080R/RV Instruction Manual page 27

"SYNC OFF" : Manual time adjustment
Adjusting Time Automatically:
Tune into an RDS station for 3 or 4 minutes.
The time adjusts automatically to the correct local time.
NOTE
The time is not adjusted when the RDS station you are tuned to
is not transmitting a time signal. Choose another RDS station in
such a case.
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