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Follow up: I went to the local Porsche dealership and talked to them. I was the first Cayenne owner to ask about it and there have been six 911 owners with the same issue. The common thread was we all had older Porsches. The date is supposed to be set by the Atomic clock that the GPS uses. Our government made an update to the GPS system which resulted in the wrong date being displayed by our older radios. I have no idea if anyone is working on a work around.
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