Why do you need international date and time
Answers
Answer:
The International Date Line functions as a “ line of demarcation ” separating two consecutive calendar dates. When you cross the date line, you become a time traveler of sorts! Cross to the west and it's one day later; cross back and you've “gone back in time."
Answer:
Because the earth is round (ahem) different parts of it see the sun differently. When it’s noon in London, it’s 6 AM in New Orleans, and 6 PM in Calcutta. It’s midnight in New Zealand.
So we have time zones, so that the sun is due south and highest in the sky at noon, local time. As you travel east, you keep setting your watch ahead. So when it’s 8 AM in San Francisco, it’s 9 AM in Denver, 10 AM in Chicago, 11 AM in New York and noon in Halifax.
So if you circle the earth, by the time you get to San Francisco again, it will be 8 AM. But what day? You’ve set your watch ahead 24 hours.
So to offset the fact that we keep “gaining” time as we go east, we have a line that offsets that gain. And we have a nice convenient ocean to drop it in. As closely as possible, the International Date Line follows 180 degrees. It zigs and zags to miss Siberia and Alaska, jogs to miss island groups in the Pacific, and bypass New Zealand. The only real problem is Antarctica, but who cares about confused penguins?
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