Most commercially available clocks aren’t perfect at keeping time. This is obvious very quickly if your clock went by by one second for every two, or the reverse, but when it’s off by a hundredth or a thousandth of a second it will take some time to show up.
Your phone is linked to a system that gets it’s time keeping off of some of the most precise clocks out there. You average digital readout click in a vehicle has no such link and was manufactured by a low bidder with the cheapest possible materials. It’s not particularly surprising, then, when it turns out that it isn’t quite as exact as you might like, and will slowly start showing the wrong (or in your case, more wrong) time.
Also, your watch suffers from the same probl am as the vehicle clock. While it’s accurate enough for most purposes, it can be off enough that it’ll show over time.
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