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Nothing happens. If nobody told you that you had crossed it, you wouldn't

notice anything, and you'd have no way of knowing it. BUT ... if you cross the

IDL and you DON'T make the appropriate change to your calendar wristwatch,

then when you arrive at your destination, everyone there will be on a different

day from you, because you'll be on the wrong one.

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11y ago

What else can I help you with?