Life near the time zone border, which included a 20 hour jump, would be very difficult, so political actors near the International Date Line simply define their time zone as an extension of +/- 12 for the convenience of people living there.
This makes the effective “data flip line” have a very funny shape, but never affect the “neighbors” for a fairly broad definition of “neighbor”. This is only possible because of how quietly populated the Pacific Ocean.
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