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Why do some countries have to adopt more than one standard time ?

2 Answers

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Because they range through such a broad range of longitudes (east-west extent) that it takes the sun considerably more than one hour to cross the whole country.
User Vbyec
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This is because they are larger and flow into several time zones. For example, in the United States, there are six time zones. 
User VulgarBinary
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