![]() ![]() UTC is a successor to, and closely approximates, Greenwich Mean Time (GMT). For example, Australian Western Standard Time (the local time in Western Australia) is set 8 hours ahead of UTC (it is UTC+8), whereas Eastern Standard Time in the United States is set 5 hours behind UTC (it is UTC-5). Coordinated Universal Time (UTC)Ĭoordinated Universal Time (UTC) is a reference by which the local time in each time zone is set. China is unusual in that just one standard time is used for the whole country, even though it extends across 60° of longitude from west to east. For example, the coterminous United States straddles four time zones and has four standard times: Eastern, Central, Mountain, and Pacific standard times. Most countries have just one time zone and one standard time, but some large countries (such as the US, Canada, and Russia) are split between several time zones, so the standard time varies across those countries. ![]() Still, they are determined by geographical factors or borders between countries or parts of countries. Although time zones are arranged roughly in longitudinal bands, in many places, the borders of a zone do not fall exactly on longitudinal meridians, as can be seen on the map (above). It is defined by the time zone or zones associated with that country or region. Standard time is the official local time in a particular country or part of a country. There are 24 one-hour time zones around the world, arranged roughly in longitudinal bands. A region of Earth's surface within which a single local time is used is called a time zone. Because of these disparities, each country or part of a country adheres to a local time. Thus, it is simultaneously morning, evening, and nighttime in different parts of the world. Because Earth is a rotating sphere, the Sun shines on only half of its surface at any one time. ![]()
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