I just found this and it worked on my JVC...I've had it a year and never knew how to set the time, it came in the car when I bought it. Hold down "SEL" until the screen changes to the Preferred Setting Mode, then you should be able to use the skip forward/back buttons on the right side to change between the settings until you get to the blinking clock. Then use the volume up/down buttons on the left to change the time. When you are done, press "SEL" again and it should return you to the regular display.

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