If timezones go around the world each hour, how do people differentiate which one changes the date?

Question

Like I get that 12AM is a new day, but if timezones go up by one hour every zone, that means that at one point, there’d be two next to each other who are on different days, right?

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Answer 1

That’s exactly how it works. In one place it’s 11 pm and in the next it’s 12 am of a new day. That’s why Guam is ‘where America’s day begins.’