![]() UTC uses a 24-hour system of time notation. Improvements in accuracy, however, the same principles used in GMT have been carried over Reliable, accurate standard for scientific and navigational purposes. Precise atomic clocks, shortwave time signals, and satellites to ensure that UTC remains a GMT became a world time and date standard because it was usedīy Britain's Royal Navy and merchant fleet during the nineteenth century. Greenwich mean time was based upon the time at the zero degree meridian that crossed All of the times and dates found here at Operators, shortwave listeners, the military, and utility radio services are also big International shortwave broadcasters in their broadcast and program schedules. Times), "universal time," and "world time." Refer to it include "Zulu time" (after the "Z" often used after UTC This was formerly known as Greenwich mean time (GMT). This standard is coordinated universal time, abbreviated UTC. Indiana introduced DST in 2006.Since radio signals can cross multiple time zones and the internationalĭate line, some worldwide standard for time and date is needed. 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). 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). ![]()
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