![]() 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). Time Zones Being Used in Dependencies of United States Offset They will become active again after the next clock change as Daylight Saving Time begins or ends. 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. However, adding the time zones of 2 uninhabited US territories, Howland Island and Baker Island, brings the total count to 11 time zones. 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).The time change in the USA always takes place at 2 o'clock of the respective local time. Unlike Europe, for example, the clock is turned on the same night, but not at the same time. Only Hawaii and most of Arizona remain on standard time all year. It always begins on the second Sunday in March and ends on the first Sunday in November. Today, daylight saving time is introduced on the same day throughout the country. However, it was not implemented until 1918 during the First World War. Daylight Saving Time in the USA Earlier than in most other countries, daylight saving time was introduced by Benjamin Franklin in 1784. Together with Wake Atoll (UTC+12), they are on the other side of the International Date Line. Guam and the Northern Mariana Islands are in Chamorro Time (UTC+10).American Samoa received its own time zone, which today also includes the atolls Midway and Palmyra, as well as Kingman Reef. ![]() Puerto Rico and the American Virgin Islands with Atlantic Time.Outside these areas, there are other territories of the USA with their own time zones as well: Later, Alaska and Hawaii also got their own time zones. In northern Arizona, there are even areas that don't even switch to daylight saving time. As many as 14 of the 50 states have two time zones. Pacific Standard Time It is worth noting that the time zones are not always aligned with state boundaries.Thus, to this day, the Ministry of Transport is responsible for the allocation of time zones and the timing of time changes.įour standard times were initially introduced in the contiguous continental United States: This was a real challenge, especially for transportation and railroads. And not even that could be reliably measured with the methods of the time. Each place set its own time based on the position of the sun. Since November 1883, there have been uniform time zones in the United States - before that, there was a jumble of over 300 different times and even more zones, which already varied from city to city.
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