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?

(In reply to re: first and second part (Spoiler) with ? on 3rd by Richard)

Then, I shall assume the time zones Mike and Yankee combine into a single time zone, and the that the IDL now divides GMT+0 into two, (GMT+12 & GMT-12).  The current meridian of the IDL would now be the prime meridian with the Mike-Yankee time zone now being GMT+0.  Canberra would be at GMT-2 and Honolulu would be at GMT+2.

In January, the two cities would share the same day for 21 hours:
Canberra -- 00:00:00 (Midnight) to 21:00:00
Honolulu -- 03:00:00 to 24:00:00 (Midnight)

In July, the two cities would share the same day for 20 hours:
Canberra -- 00:00:00 (Midnight) to 20:00:00
Honolulu -- 04:00:00 to 24:00:00 (Midnight)

As given in the question to the second part, Canberra would be magically moved just west of the IDL and Honolulu just east of it. The shared times would also be the same as the answer given to the second question.

Edited on July 12, 2006, 5:17 am

Posted by Dej Mar on 2006-07-12 04:41:35