Why Are Some Time Zones 30 Minutes Off Instead of an Hour?: Quick Facts

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The Information Architects of Encyclopaedia Britannica

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World map showing standard time zones, with each zone shaded and labeled by its offset from Greenwich Mean Time. The International Date Line is marked with a bold, zigzagging line in the Pacific Ocean, and variations for half-hour and other non-standard offsets are indicated. Continents, major countries, and oceans are labeled for reference.

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time zone Indian time zone Why are there different time zones?Time Zones in the United States