Eastern Time Zone

Eastern (EST)ESTEDTEasternEastern (EDT)Eastern TimeETEastern Daylight TimeEastern Standard TimeETZ
The Eastern Time Zone (ET) is a time zone encompassing part or all of 22 states in the eastern part of the contiguous United States, parts of eastern Canada, the state of Quintana Roo in Mexico, Panama in Central America, and certain Caribbean and Atlantic islands, along with certain countries and parts of countries in South America.wikipedia
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Time zone

Sri Lanka Standard Time Zonetime zoneslocal time
The Eastern Time Zone (ET) is a time zone encompassing part or all of 22 states in the eastern part of the contiguous United States, parts of eastern Canada, the state of Quintana Roo in Mexico, Panama in Central America, and certain Caribbean and Atlantic islands, along with certain countries and parts of countries in South America.
A notable exception was Detroit (which is about halfway between the meridians of eastern time and central time) which kept local time until 1900, then tried Central Standard Time, local mean time, and Eastern Standard Time before a May 1915 ordinance settled on EST and was ratified by popular vote in August 1916.

UTC−05:00

UTC−5UTC-5UTC-05
Places that use Eastern Standard Time (EST) when observing standard time (autumn/winter) are five hours behind Coordinated Universal Time (UTC−05:00).
In North America, it is observed in the Eastern Time Zone during standard time, and in the Central Time Zone during the other eight months (see Daylight saving time).

UTC−04:00

UTC-4UTC−4UTC-04
Eastern Daylight Time (EDT), when observing daylight saving time (spring/summer), is four hours behind Coordinated Universal Time (UTC−04:00).
It is observed in the Eastern Time Zone (e.g., Canada and the United States) during the warm months of daylight saving time, as Eastern Daylight Time.

Daylight saving time

DSTdaylight savingPST
Eastern Daylight Time (EDT), when observing daylight saving time (spring/summer), is four hours behind Coordinated Universal Time (UTC−04:00).
For example, Central European Time is usually six hours ahead of North American Eastern Time, except for a few weeks in March and October/November, while the United Kingdom and mainland Chile could be five hours apart during the northern summer, three hours during the southern summer, and four hours for a few weeks per year.

Central Time Zone

Central (CST)CSTCentral Standard Time
The boundary between time zones is set forth in the Code of Federal Regulations, with the boundary between the Eastern and Central Time Zones being specifically detailed at 49 CFR 71.

Massachusetts

MACommonwealth of MassachusettsMass.
Two pressure cooker bombs exploded near the finish line of the Boston Marathon on April 15, 2013, at around 2:49 pm EDT.

Quintana Roo

Quintana Roo TerritoryCancúnRiviera Maya
The Eastern Time Zone (ET) is a time zone encompassing part or all of 22 states in the eastern part of the contiguous United States, parts of eastern Canada, the state of Quintana Roo in Mexico, Panama in Central America, and certain Caribbean and Atlantic islands, along with certain countries and parts of countries in South America.

Gulf County, Florida

GulfGulf CountyGulf Counties
By way of the Intracoastal Waterway, Gulf County is one of a small number of counties in the United States to be under two time zones, Eastern and Central in this case.

Panama

PanamáRepublic of PanamaPAN
The Eastern Time Zone (ET) is a time zone encompassing part or all of 22 states in the eastern part of the contiguous United States, parts of eastern Canada, the state of Quintana Roo in Mexico, Panama in Central America, and certain Caribbean and Atlantic islands, along with certain countries and parts of countries in South America.

East Tennessee

eastern TennesseeEasteastern portion
East Tennessee consists of 33 counties, 30 located within the Eastern Time Zone and three counties in the Central Time Zone, namely Bledsoe, Cumberland, and Marion.

Indiana

INState of IndianaInd.
At present most of the state observes Eastern Time; six counties near Chicago and six near Evansville observe Central Time.

New York City

New YorkNew York, New YorkNew York City, New York
The largest city in the Eastern Time Zone is New York; the New York metropolitan area is the largest metropolitan area in the zone.

New York metropolitan area

New York City metropolitan areaCombined Statistical AreaNew York
The largest city in the Eastern Time Zone is New York; the New York metropolitan area is the largest metropolitan area in the zone.

Phenix City, Alabama

Phenix CityPhenix City, ALCentral High School
It is the easternmost settlement in the state of Alabama as well as the Central Time Zone, but it and some other nearby areas unofficially observe Eastern Time, as these areas are part of the metropolitan area of the considerably larger city of Columbus, Georgia, which is in the Eastern Time Zone.

Florida

FLState of FloridaFloridian
In March 2018, the Florida Legislature passed a bill requesting authorization from Congress for year-round daylight saving time, which would effectively put Florida on Atlantic Standard Time year-round (except for west of the Apalachicola River, which would be on Eastern Standard Time year-round).

Atlantic Time Zone

ASTAtlantic Standard TimeADT
In March 2018, the Florida Legislature passed a bill requesting authorization from Congress for year-round daylight saving time, which would effectively put Florida on Atlantic Standard Time year-round (except for west of the Apalachicola River, which would be on Eastern Standard Time year-round).
Most of the state would permanently keep Eastern Daylight Time, which is equivalent to Atlantic Standard Time; the state's panhandle region would move to year-round Central Daylight Time / Eastern Standard Time.

Upper Peninsula of Michigan

Upper PeninsulaUpper MichiganUpper
Like the entire Lower Peninsula, most of the Upper Peninsula observes Eastern Time.

Effects of time zones on North American broadcasting

ET/PTdifference in local airtimesEffects of time on North American broadcasting
* Effects of time zones on North American broadcasting
The United States (excluding territories) has six time zones (Hawaii–Aleutian, Alaska, Pacific, Mountain, Central and Eastern), with further variation in the observance of daylight saving time.