Eastern Time Zone
Eastern Time Zone (ET) is a time zone encompassing 17 U.S. 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 the Caribbean Islands.
Places that use Eastern Standard Time (EST) when observing standard
time (autumn/winter) are 5 hours behind Coordinated Universal Time
Eastern Daylight Time (EDT), when observing daylight saving time DST
(spring/summer) is 4 hours behind Coordinated Universal Time
In the northern parts of the time zone, on the second Sunday in March,
at 2:00 a.m. EST, clocks are advanced to 3:00 a.m. EDT
leaving a one-hour "gap". On the first Sunday in November, at
2:00 a.m. EDT, clocks are moved back to 1:00 a.m. EST, thus
"duplicating" one hour. Southern parts of the zone (
Panama and the
Caribbean) do not observe daylight saving time.
2 Daylight Saving Time
4 United States
6 Caribbean Islands
7 Central and South America
8 See also
10 External links
The boundaries of the
Eastern Time Zone
Eastern Time Zone have moved westward since the
Interstate Commerce Commission took over time-zone management from
railroads in 1938. For example, the easternmost and northernmost
Kentucky were added to the zone in the 1940s, and in 1961
most of the state went Eastern. In 2000, Wayne County, on the
Tennessee border, switched from Central to Eastern. In March 2018,
Florida Legislature passed a bill requesting authorization from
Congress for year-round daylight savings time, which would effectively
Florida on Atlantic Standard Time year-round.
Daylight Saving Time
Uniform Time Act
Uniform Time Act of 1966 ruled that daylight saving time would run
from the last Sunday of April until the last Sunday in October in the
United States. The act was amended to make the first Sunday in
April the beginning of daylight saving time as of 1987. The Energy
Policy Act of 2005 extended daylight saving time in the United States
beginning in 2007. So local times change at 2:00 a.m. EST to
3:00 a.m. EDT on the second Sunday in March and return at
2:00 a.m. EDT to 1:00 a.m. EST on the first Sunday in
November. In Canada, the time changes as it does in the United
Main article: Time in Canada
In Canada, the following provinces and territories are part of the
Eastern Time Zone:
Ontario, most of
Quebec, most of
Nunavut, most of
All observe Daylight Saving Time in sync with the United States, with
very localized exceptions.
Main article: Time in the United States
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.
Seventeen states and
Washington, D.C. are located entirely within the
Eastern Time Zone, they are:
Five states are partly in both the
Eastern Time Zone
Eastern Time Zone and the Central
Time Zone, they are:
Florida - peninsula and Big Bend regions east of the Apalachicola
River along with portions of Gulf County south of the Intracoastal
Indiana - all except for northwest and southwest regions
Kentucky - eastern 60%
Michigan: all, except for Gogebic, Iron, Dickinson, and Menominee
Tennessee: East Tennessee
 Eastern Time is also used somewhat as a de facto official time for
all of the United States because it includes the capital city
(Washington D.C.), the most populous city (New York City), and half of
the country’s population. For this reason, media organizations will
often report when events happened or are scheduled to happen in
Eastern Time even if they occurred in another time zone, and TV
schedules are also almost always posted in Eastern Time. In the United
States, all nationally televised morning programs (except Good Morning
America Weekend Edition which some ABC affiliates on the east coast
air on a tape-delay), some daytime talk shows, evening newscasts, most
talent and awards shows, and any other nationally televised event that
airs live on American television during prime time and on the weekends
(such as sports television) are broadcast live in the Eastern Time
Zone. Major professional sports leagues also post all game times in
Eastern time, even if both teams are from the same time zone, outside
of Eastern Time. For example, a game time between two teams from
Pacific Time Zone
Pacific Time Zone will still be posted in Eastern time (for example,
one may see "Seattle at Los Angeles" with "10:00 p.m." posted as
the start time for the game, often without even clarifying the time is
posted in Eastern time).
Most cable television and national broadcast networks advertise airing
times in Eastern time. National broadcast networks (ABC, CBS, The CW,
FOX, NBC) generally have two primary feeds, an eastern feed for
Eastern and Central time zones, and a tape-delayed western feed for
the Pacific Time Zone. The prime time is set on Eastern and Pacific at
8:00 p.m., with the Central time zone stations receiving the
eastern feed at 7:00 p.m. local time.
Mountain Time Zone
Mountain Time Zone stations
receive a separate feed at 7:00 p.m. local time.
As Arizona does not observe daylight saving time, during the summer
months, it has its own feed at 7:00 p.m. local time.[citation
needed] Cable channels with a separate western feed (such as HBO,
whose western feed is called "HBOW") generally air the same
programming as the eastern feed delayed by three hours. Other cable
networks such as the Discovery family of networks repeat their prime
time programming three hours later; this allows for the same show to
be advertised as airing at "8:00 p.m. E/P" (that is,
"8:00 p.m. Eastern and Pacific time"). Networks specializing in
the airing of sports events, such as ESPN, advertise all of their
programming in Eastern and Pacific, incorporating the 3-hour time
difference (as in "8:00 p.m. Eastern/5:00 p.m. Pacific") and
leaving viewers in the remaining time zones to calculate start time in
their own areas.
Main article: Time in Mexico
Quintana Roo: this eastern state followed CST for an almost-17-year
period (1982 to some time in 1998). After more than two years of
lobbying by a coalition of local hotel owners with the backing of the
state's government, the Federal government approved the change to
Quintana Roo's time zone, moving it from Central Standard Time (CST)
to Eastern Standard Time (EST). The time change took effect on
February 1, 2015.
The Bahamas officially observe both Eastern Standard Time during the
winter months and Eastern Daylight Time during the summer months. Cuba
is usually the same, with Eastern Standard Time in the winter, and
Eastern Daylight Time in the summer, but it often changes on different
days. Cayman Islands, Haiti, and
Jamaica use Eastern Standard Time
Turks and Caicos Islands
Turks and Caicos Islands used to follow eastern time
with daylight saving but switched in 2015 to the Atlantic Time Zone.
Central and South America
Central America uses Eastern Standard Time UTC−05
year-round. The state of Acre and the southwest part of the state of
Amazonas all in
Brazil as well as Colombia,
Ecuador (except for the
Galápagos Islands, which uses Central Standard Time), and
South America also use EST (UTC−5) all year-round.
Effects of time zones on North American broadcasting
The time zone used in Eastern Australia is also called Eastern Time
Zone. See Time in Australia.
^ "Why Louisville?". Louisville magazine. Retrieved 10 February
^ Klas, Mary Ellen (6 March 2018). "Legislature approves year-round
daylight saving time — but it's not a done deal yet". Miami Herald.
Retrieved 30 March 2018.
^ a b c Prerau, David (2006). "Early adoption and U.S. Law". Daylight
Saving Time. Web Exhibit. Retrieved 2007-04-23.
^ Law, Gwillim (2007-09-21). "United States Time Zones".
^ "Daylight Saving Time Starts Sunday". Government of Ontario.
2008-03-07. Retrieved 2010-09-21.
^ The specification for the
Eastern Time Zone
Eastern Time Zone is set forth at 49 CFR
71.4, and is listed in Text and pdf formats. The boundary between
Eastern and Central is set forth at 49 CFR 71.5, and is listed in text
and pdf formats.
^ "SIID División de Politica Social "Horario de Verano. Antecedentes
y legislación comparada"" (in Spanish). Chamber of Deputies (Mexico).
^ a b "On Mexican Time: Changing Time Zones To Accommodate Tourism".
Forbes. Retrieved 29 January 2015.
Official U.S. time in the Eastern time zone
North American Time Zone border data and images
World time zone map
U.S. time zone map
History of U.S. time zones and UTC conversion
Canada time zone map
Time zones for major world cities
Official times across Canada
Federal Regulations defining time zones
Time zones in North America
Hours from UTC: Standard time
Hours from UTC: Daylight saving time
Hawaii–Aleutian (in Hawaii)
Hawaii–Aleutian (in Alaska)
Mountain (Arizona and Sonora only)
Mountain (other states/provinces)
Central (Saskatchewan only)
Central (other states/provinces)
Eastern (parts of
Nunavut and the Caribbean)
Eastern (other states/provinces)
Atlantic (Natashquan River)
Atlantic (other states/provinces)
Saint Pierre and Miquelon
and most of Greenland
Time in Canada
Time in Denmark
Time in Mexico