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When Is It Today? (Posted on 2006-07-11) Difficulty: 2 of 5
In the local time of each, during what times of the 24-hour day in January, and in July, is it the same day of the week in Canberra and in Honolulu? Canberra goes on daylight savings time in summer but Honolulu does not. Standard time in Canberra is GMT plus 10 hours, whereas Honolulu time is GMT minus 10 hours.

What would the answer be if somehow (by magic, perhaps) Australia and Hawaii were to be moved so that standard time in Canberra was GMT plus 12 hours and time in Honolulu was GMT minus 12 hours?

How would the answers to the questions above be affected if the International Date Line were moved to the prime meridian instead of being (roughly) directly opposite as it now is?

See The Solution Submitted by Richard    
Rating: 4.0000 (2 votes)

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Solution first part | Comment 1 of 14

In January (summer in Australia), Canberra is effectively GMT plus 11 hours, while Hawaii is at its wintertime GMT minus 10.  So the new day for the world is only 1 hour old when it reaches Canberra at local midnight, placing it a day later than Hawaiii, where it's 3 AM the previous day. Then, 21 hours later, what was the new day and now is getting pretty old, catches up to Hawaii, where from Midnight Hawaiian time, 9 PM Canberra time, they shre the same day. So for Canberra, it's 9PM to midnight and in Hawaii, it's midnight to 3.

In July, Canberra's zone is effectivly GMT plus 10 hhours while Hawaii is at -9.  So in Hawaii itās midnight to 5 AM, while in Canberra it's 7 pm to midnight.


  Posted by Charlie on 2006-07-11 15:02:42
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