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).To convert EDT to PDT, you have to subtract three hours. Eastern Daylight Time (EDT) is 3 hours ahead of Pacific Daylight Time (PDT).Most programming languages have libraries to help you converting time zones, calculating by hand might not be a good idea because of the variety of time zones en daylight saving times. To convert EDT to MDT, you have to subtract two hours. This means you might have convert time zones to calculate timestamps. Eastern Daylight Time (EDT) is 2 hours ahead of Mountain Daylight Time (MSDT).To convert EDT to CDT, you have to subtract one hour. Eastern Daylight Time (EDT) is 1 hour ahead of Central Daylight Time (CDT). Time in States and Federal Districts in USA (51 States and Federal Districts Listed Below, 13 States and Federal Districts Have Multiple Time Zones) Alabama.Most North American time zones also have generic terms, including Pacific Time (PT), Mountain Time (MT), Central Time (CT), and Atlantic Time (AT).Ĭonverting Eastern Time to Other US Time Zones This can add a bit of confusion as the term Eastern Time does not differentiate between standard time and Daylight Saving Time, so Eastern Time switches between EST and EDT in areas that use DST during part of the year. In everyday usage, EDT is often referred to as Eastern Time (ET) or the Eastern Time Zone. Eastern Standard Time (EST) is used during the remainder of the year. EDT or EST?Įastern Daylight Time (EDT) is a North American time zone in use from the second Sunday in March to the first Sunday in November during Daylight Saving Time (DST). In North America, Eastern Standard Time shares a border with Atlantic Daylight Time (ADT) in the east and with Central Daylight Time (CDT) in the west. The time zone spans from northern Canada to Haiti. It is also used in the Caribbean.Īlmost half of the population in the USA live in the EDT time zone. It covers all or parts of 23 states in the US and three provinces or territories in Canada. See full time zone map What Is Eastern Daylight Time?Įastern Daylight Time is the easternmost time zone in the United States. This time zone is a Daylight Saving Time time zone and is used in: North America, Caribbean. Business Date to Date (exclude holidays)Ĭurrently observing EDT – Eastern Daylight Time.Ĭurrently has same time zone offset as EDT (UTC -4) but different time zone name.Įastern Daylight Time (EDT) is 4 hours behind Coordinated Universal Time (UTC).
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