Time zones. There are 24 since it takes the earth about 24 hours to spin 1 complete rotation, so depending on where you’re at, it could be day/night. The difference is how we mark what part of that 24 hour cycle your zone is in, which is why some happen to be “the next day” ahead. That’s only because their daylight began before the next one west of them. They’re not actually in the future, they’re just ahead on the rotation of the earth, or at least where we chose to draw the line.
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