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Each country decides on the borders and the offsets of the time zones within its jurisdiction, including if and when daylight saving time or summer time begins and ends. Unfortunately, this has lead to such a wide variety of rules that you cannot assume a certain time offset at a certain place based solely on its longitude.

The most thorough and up-to-date resource that I have found for sorting through the variety is the Time and Date web site.

Generally speaking, every time zone can be identified by its offset from Coordinated Universal Time (UTC). For example, the time in Tokyo is UTC + 9 hrs., and the time in New York is UTC - 5 hrs. for part of the year and UTC - 4 hrs. for part of the year.

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13y ago

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How many degrees are in each standard time zone?

There are 15 degrees of longitude in each standard time zone


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Does each time zone have one hour of time?

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