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). 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).Swatch even invented a concept called beat time that split each day into 1,000 beats on a decimal system, eradicating time zones entirely.įor those of you who don't operate on Internet Time, this spreadsheet shows the time zone in 195 countries, extracted from our World Factfiles series. The development of the world wide web in the 1990s led to calls for a standardised internet time, as people in cyberspace were no longer bound by geography. Kiribati even extended its time zone 600 miles east in 1995, to include Caroline Island in the same zone (and, as it straddled the Date Line opposite the GMT meridian, the same date) as the country's other islands. Other time zones are counted to the east and west of this line, either plus or minus hours from GMT.Įach country sets its own time zone within this framework, so some zones extend beyond the meridian for convenience, while others, like India, take on half hours. The prime meridian, determined by the 1884 conference, runs through Greenwich, in the UK, giving us Greenwich Mean Time. The zones are based on 24 longitudinal meridian lines that run from the north to south poles. The Meridian Conference in 1884, attended by representatives from various countries, led to the creation of the 24 time zones we use today. Increasing globalisation in the Victorian era meant a need to standardise time zones, as businesses began to operate across wider areas and world travel became easier with the advent of the railway.
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