![]() ![]() Most of Arizona and Hawaii don't use DST. In addition the uninhabited atolls of Baker Island (AoE) and Wake Island (WAKT) add to the time zone count, making 11 the total number of time zones in the US.Īlmost all states in the US use Daylight Saving Time (DST). There are 9 official time zones according to the law. The time zones in the law are defined by their offset from Coordinated Universal Time (UTC). Code, Title 15, Chapter 6, Subchapter IX - Standard Time. Time zones in the USA are defined in the U.S. Since 1967, the US Department of Transportation (DOT) has been responsible for governing time zones in the country. The US was divided into 4 standard time zones on November 18, 1883, and jurisdiction for the zones was given to the Interstate Commerce Commission (ICC). In military GMT is known as Zulu time. Time Zones Being Used in Dependencies of United States Offset It is now often used to refer to Coordinated Universal Time (UTC) when this is viewed as a time zone, and in casual use for the most parts it is the same. Time zone changes for: Year Date & Time Abbreviation Time Change Offset After 2023: Sun, Mar 26 at 1:00 am: GMT BST +1 hour (DST start) UTC+1h : Sun, Oct 29 at 2:00 am: BST GMT-1 hour (DST end) UTC: 2024: Sun, Mar 31 at 1:00 am. They will become active again after the next clock change as Daylight Saving Time begins or ends. GMT is a time zone used in the UK and other European and African countries. The above time zones are used during other parts of the year. Time Zones Not Currently Being Observed in United States Offset Note: Local time in these time zones changes when Daylight Saving Time begins and ends. In practice, this means that the local time in these time zones changes when DST begins and ends. For example, Eastern Time (ET) refers to Eastern Standard Time (EST) or Eastern Daylight Time (EDT), depending on which is currently in use. The time zones in the contiguous US are often referred to by their generic name, without making a difference between standard time and Daylight Saving Time designations. Generalized Time Zones in United States Time Zone Abbreviation & Name Since Howland Island and Baker Island constitute the world's westernmost landmasses in relation to the International Date Line, making them the last places on Earth where any date exists, they are sometimes assigned a theoretical 12th time zone called Anywhere on Earth (AoE). As neither Hawaii nor the 5 dependencies use Daylight Saving Time (DST), there are only 6 corresponding DST time zones. In addition, Alaska, Hawaii, and 5 US dependencies all have their own time zones. The contiguous US has 4 standard time zones. In the UTC standard, there is a commitment to keep within 0. Time difference between time zones can be expressed by the GMT or UTC hour difference. However, adding the time zones of 2 uninhabited US territories, Howland Island and Baker Island, brings the total count to 11 time zones. Nowadays, Greenwich Mean Time, abbreviated as GMT, is a time zone designation rather than a time standard. There are 9 time zones by law in the USA and its dependencies. Time Zones Currently Being Used in United States Offset Business Date to Date (exclude holidays).In military GMT is known as Zulu time.Greenwich Mean Time was the same as Universal Time (UT), until the introduction of UTC in 1972 a standard astronomical concept used in many technical fields. It is now often used to refer to Coordinated Universal Time (UTC) when this is viewed as a time zone, and in casual use for the most parts it is the same. Greenwich Mean Time (GMT) originally referred to the mean solar time at the Royal Observatory in Greenwich, London. Other major cities in the area are Abidjan, Dakar, Grand Dakar, Accra ![]() Principal Cities: The largest city in the GMT timezone is London from United Kingdom with population about 7.557 million people. Offset: GMT is 0 hours ahead Greenwich Mean Time (GMT) and is used in EuropeĬountries: It is used in following countries: Burkina Faso, Côte d'Ivoire, Britain (UK), Guernsey, Ghana, Greenland, Gambia, Guinea, Guinea-Bissau, Ireland, Isle of Man, Iceland, Jersey, Liberia, Mali, Mauritania, St Helena, Sierra Leone, Senegal, Sao Tome & Principe, Togo ![]()
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