![]() Generally, a time change of 1 hour is required with each 15° change of longitude, but this does not necessarily always happen. Nepal, the final holdout, did not adopt a standard offset of UTC until 1956, and even then, has a less common offset of UTC+5:45. It wasn't until 1929 before most countries adopted hourly time zones. Time zones throughout the world vary, and used to vary even more than they currently do. ![]() Most commonly, UTC is offset by an hour, but in some cases, the offset can be a half-hour or quarter-hour, such as in the case of UTC+06:30 and UTC+12:45. UTC offset can range from UTC-12:00 to UTC+14:00. Generally, time zones are defined as + or - an integer number of hours in relation to UTC for example, UTC-05:00, UTC+08:00, and so on. UTC breaks time into days, hours, minutes, and seconds, where days are usually defined in terms of the Gregorian calendar. Most time zones that are on land are offset from UTC. UTC is not dependent on daylight saving time (DST), though some countries switch between time zones during their DST period, such as the United Kingdom using British Summer Time in the summer months. UTC, which is based on highly precise atomic clocks and the Earth's rotation, is the new standard of today. Although GMT used to be a time standard, it is now mainly used as the time zone for certain countries in Africa and Western Europe. Although GMT and Coordinated Universal Time (UTC) essentially reflect the same time, GMT is a time zone, while UTC is a time standard that is used as a basis for civil time and time zones worldwide. Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory located in Greenwich, London, considered to be located at a longitude of zero degrees. They are often based on the boundaries of countries or lines of longitude. The DST runs from 2 pm on the 2nd Sunday in March to 2 am on the first Sunday in November.Related Time Calculator | Date CalculatorĪ time zone is a region on Earth that uses a uniform time. The Daylight Saving Time (DST) is observed in the whole of US states and territories except in Hawaii, Puerto Rico, American Samoa, US Virgin Island, and Arizona (observed only in Navajo Nation). For instance, Howland Island and Baker Island use UTC-12:00 and are sometimes assigned Anywhere on Earth (AoE). The US also possesses outlying islands which do not observe any of the nine time zones. The US territories observe Samoa Time Zone (American Samoa), Atlantic Time Zone (US Virginia Islands and Puerto Rico), and Chamorro Time Zone (the Northern Mariana Islands and Guam). The state of Alaska observes Alaskan Time Zone (UTC-09:00), while Hawaii and parts of the Aleutian Islands have Hawaii-Aleutian Time Zone (UTC-09:00). For instance, Eastern Time refers to EST or EDT. The time zones observed by the 48 states use generic names, without highlighting the difference between DST and standard time designations. The DST is observed in all of the contiguous states except Arizona (observed only in the Navajo Nation). Washington, Nevada, California, and parts of Oregon and Idaho observe Pacific Time Zone (UTC-07:00) while the states straddled by the Rocky Mountains and Great Plains’ western quarter have Mountain Time Zone (UTC-06:00). The second time zone on the contiguous US is the Central Standard Time (UTC-05:00), observed fully by ten states and partly by the other ten states occupying the Mississippi Valley, Gulf Coast, and parts of the Great Plains. ![]() However, Indiana, Florida, Kentucky, Tennessee partially use this time zone. All or most of the 23 states in the eastern US, including those on the Atlantic coast, observe Eastern Time Zone (UTC-04:00). These states fall within four time zones. ![]() The contiguous US comprises 48 states located within continental North America. The Department of Transportation regulates the DST and time zone boundaries in the US. The contiguous US observes four time zones, while Hawaii, Alaska, and each of the five territories has its time zone. From west to east, the nine US time zones are Chamorro Standard Time (UTC+10), Samoa Standard Time, Hawaii-Aleutian Standard Time (HST), Alaskan Standard Time (AKST), Pacific Standard Time (PST), Mountain Standard Time, Central Standard Time, Eastern Standard Time (EST), and Atlantic Standard Time (AST). By Law, the United States of America and its territories use nine time zones, with most of the county observing DST (daylight saving time) for much of spring, fall, and summer months.
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