that thing about time

"So, tell me the thing about going around the world again, Teacher."

"So if you travel around the world, leaving Monday at noon, traveling so as to offset the motion of the earth, and take 24 hours to traverse the circumference, then the time that you arrive is one day later, Tuesday at noon. As you traveled, every hour from the time you left you would ask somebody,

'hey, what time is it?'

'Noon,' would always be the reply."

"But, then what day would it be for the people you ask?"

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It's 10PM where you live. you pick up the phone and call your friend Sara in seattle. It's 7PM there. They are in the same day as you, but London, at 2AM is in the morning, is already tomorrow.

Half way around the world, it's 10AM, what day is it?

It's tomorrow.

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you pick up a phone. anyone you call upon answering states the current time.

you dial the first number, "10PM, yesterday", it was your friend Sara again, in Seattle, it's 2AM for you on a Tuesday morning, but for Sara it's still Monday night.

You call NY, "2AM today" answers.

at 11 AM you can call yesterday, but at 1PM you can call tomorrow.

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if you still don't believe me, check out this link i found when i wiki'ed International Date Line

International Dateline Wikipedia

P.S. The 3rd paragraph is legendary!