All Topics  
Mountain Time Zone

 

 
   Email Print
   Bookmark   Link
 

 

Mountain Time Zone
 
 
  Topics Mountain Time Zone Topic Home

The Mountain Time Zone of North America
North America

North America is the northern continent of the Americas, situated in the Earth's northern hemisphere and almost totally in the western hemisphere....
 keeps time by subtracting seven hours from Coordinated Universal Time
Coordinated Universal Time

Coordinated Universal Time is a time standard based on International Atomic Time with leap seconds added at irregular intervals to compensate for the Earth's slowing rotation....
, sometimes called Greenwich Mean Time
Greenwich Mean Time

Greenwich Mean Time is a term originally referring to solar time at the Royal Observatory, Greenwich in Greenwich, London. It is regularly used to refer to Coordinated Universal Time when this is viewed as a time zone, especially by bodies connected with the United Kingdom, such as the BBC World Service, the Royal Navy, the Met Office an...
 (UTC-7
UTC-7

UTC-7 can be observed in:...
) during the shortest days of autumn and winter, and by subtracting six hours during daylight saving time
Daylight saving time

Daylight saving time is the convention of advancing clocks so that afternoons have more daylight and mornings have less. Typically clocks are adjusted forward one hour near the start of spring and are adjusted backward in autumn....
 in the spring, summer, and early autumn (UTC-6
UTC-6

Sorry, no overview for this topic
). The clock time in this zone is based on the mean solar time of the 105th meridian west
105th meridian west

The meridian 105? west of Prime Meridian is a line of longitude that extends from the North Pole across the Arctic Ocean, North America, the Pacific Ocean, the Southern Ocean, and Antarctica to the South Pole....
 of the Greenwich Observatory.

In the United States
United States

The United States of America is a Federal government constitutional republic comprising U.S. state and a federal district. The country is situated mostly in central North America, where its Contiguous United States and Washington, D.C., the Capital districts and territories, lie between the Pacific Ocean and Atlantic Oceans, Borders of the U...
 and Canada
Canada

Canada is a country occupying most of northern North America, extending from the Atlantic Ocean in the east to the Pacific Ocean in the west and northward into the Arctic Ocean....
, this time zone is generically called Mountain Time (MT).






Discussion
Ask a question about 'Mountain Time Zone'
Start a new discussion about 'Mountain Time Zone'
Answer questions from other users
Full Discussion Forum



Encyclopedia


Timezoneswest
The Mountain Time Zone of North America
North America

North America is the northern continent of the Americas, situated in the Earth's northern hemisphere and almost totally in the western hemisphere....
 keeps time by subtracting seven hours from Coordinated Universal Time
Coordinated Universal Time

Coordinated Universal Time is a time standard based on International Atomic Time with leap seconds added at irregular intervals to compensate for the Earth's slowing rotation....
, sometimes called Greenwich Mean Time
Greenwich Mean Time

Greenwich Mean Time is a term originally referring to solar time at the Royal Observatory, Greenwich in Greenwich, London. It is regularly used to refer to Coordinated Universal Time when this is viewed as a time zone, especially by bodies connected with the United Kingdom, such as the BBC World Service, the Royal Navy, the Met Office an...
 (UTC-7
UTC-7

UTC-7 can be observed in:...
) during the shortest days of autumn and winter, and by subtracting six hours during daylight saving time
Daylight saving time

Daylight saving time is the convention of advancing clocks so that afternoons have more daylight and mornings have less. Typically clocks are adjusted forward one hour near the start of spring and are adjusted backward in autumn....
 in the spring, summer, and early autumn (UTC-6
UTC-6

Sorry, no overview for this topic
). The clock time in this zone is based on the mean solar time of the 105th meridian west
105th meridian west

The meridian 105? west of Prime Meridian is a line of longitude that extends from the North Pole across the Arctic Ocean, North America, the Pacific Ocean, the Southern Ocean, and Antarctica to the South Pole....
 of the Greenwich Observatory.

In the United States
United States

The United States of America is a Federal government constitutional republic comprising U.S. state and a federal district. The country is situated mostly in central North America, where its Contiguous United States and Washington, D.C., the Capital districts and territories, lie between the Pacific Ocean and Atlantic Oceans, Borders of the U...
 and Canada
Canada

Canada is a country occupying most of northern North America, extending from the Atlantic Ocean in the east to the Pacific Ocean in the west and northward into the Arctic Ocean....
, this time zone is generically called Mountain Time (MT). Specifically, it is Mountain Standard Time (MST) when observing standard time
Standard time

Standard time is the result of synchronizing clocks in different geographical locations within a time zone to the same time rather than using the local meridian as in local mean time or solar time....
 (Winter
Winter

Winter is one of the four seasons of temperate zones. Calculated astronomy, it begins on the solstice and ends on the equinox. It is the season with the shortest days and the lowest average temperatures....
), and Mountain Daylight Time (MDT) when observing daylight saving time. In Mexico
Mexico

The United Mexican States , commonly known as Mexico , is a federalism constitutionalism republic in North America. It is bordered on the north by the United States; on the south and west by the Pacific Ocean; on the southeast by Guatemala, Belize, and the Caribbean Sea; and on the east by the Gulf of Mexico....
 this time is known as the Pacific Zone. In the USA, the exact specification for the location of time zone
Time zone

A time zone is a region of the earth that has uniform standard time, usually referred to as the local time. By convention, time zones compute their local time as an offset from Coordinated Universal Time ....
s and the dividing line between zones is set forth in the Code of Federal Regulations
Code of Federal Regulations

File:Codeoffederalregulations.jpgThe Code of Federal Regulations is the codification of the general and permanent rules and regulations published in the Federal Register by the executive departments and agencies of the Federal Government of the United States....
 at 49 CFR 71.The boundary between Central and Mountain is set forth at 49 CFR 71.7, and is listed in and formats. The boundary between Mountain and Pacific is set forth at 49 CFR 71.9, and is listed in and formats.

The zone is one hour ahead of the Pacific Time Zone
Pacific Time Zone

The Pacific Time Zone observes standard time by subtracting eight hours from Coordinated Universal Time . The clock time in this zone is based on the mean solar time of the 120th meridian west of the Greenwich Observatory....
 and one hour behind the Central Time Zone
Central Time zone

The Central Time Zone is in the Americas and observes standard time by subtracting six hours from Coordinated Universal Time during standard time and five hours during daylight saving time ....
.

In some areas, starting in 2007, the local time changes from MST to MDT at 02:00 LST to 03:00 LDT on the second Sunday in March and returns at 02:00 LDT to 01:00 LST on the first Sunday in November.

TV broadcasting in the Mountain Time Zone is typically tape-delayed one hour, so that shows match the broadcast times of the Central Time Zone
Central Time zone

The Central Time Zone is in the Americas and observes standard time by subtracting six hours from Coordinated Universal Time during standard time and five hours during daylight saving time ....
 (i.e. prime time begins at 7:00 p.m. MT following the same order of programming as the other two time zones).

Canada

The following provinces and areas are part of the Mountain Time Zone:

  • Alberta
    Alberta

    Alberta is one of Canada Canadian Prairies Provinces and territories of Canada. It became a province on September 1, 1905.Alberta is located in western Canada, bounded by the provinces of British Columbia to the west and Saskatchewan to the east, the Northwest Territories to the north, and the U.S....
  • the Northwest Territories
    Northwest Territories

    The Northwest Territories are a provinces and territories of Canada of Canada.Located in northern Canada, it borders Canada's two other territories, Yukon to the west and Nunavut to the east, and three provinces: British Columbia to the southwest, Alberta and Saskatchewan to the south....
     (except for Tungsten
    Tungsten, Northwest Territories

    The townsite of Tungsten is located at Cantung Mine in the Northwest Territories. It is accessible from Watson Lake, Yukon, Yukon. Tungsten was built in 1961 and the tungsten mine went into operation in 1962 as a large Open-pit mining high in the Mackenzie Mountains....
    )
  • most of the Kitikmeot Region
    Kitikmeot Region, Nunavut

    Kitikmeot Region is an Region regions of Nunavut Nunavut. It consists of the southern and eastern parts of Victoria Island with the adjacent part of the mainland as far as the Boothia Peninsula, together with King William Island and the southern portion of Prince of Wales Island, Nunavut....
     of Nunavut
    Nunavut

    Nunavut is the largest and newest Provinces and territories of Canada of Canada; it was separated officially from the Northwest Territories on April 1, 1999 via the Nunavut Act and the Nunavut Land Claims Agreement Act, though the actual boundaries had been established in 1993....
  • portions of southeastern and northeastern British Columbia
    British Columbia

    British Columbia is the westernmost of Canada's Provinces and territories of Canada and is famed for its natural beauty, as reflected in its Latin motto, Splendor sine occasu ....
  • the area of Saskatchewan
    Saskatchewan

    Saskatchewan is a prairie provinces in Canada, which has an area of 588,276.09 square kilometres and a population of 1,015,895 , mostly living in the southern half of the province....
     immediately surrounding the city of Lloydminster
    Lloydminster

    Lloydminster is a Canada city which has the unusual geography distinction of straddling a provincial border. Unlike most such cases , Lloydminster is not a pair of twin cities on opposite sides of a border which merely share the same name, but is actually incorporated as a single city with a single municipal administration....

Mexico

The following states are part of the Mountain Time Zone:

  • Baja California Sur
    Baja California Sur

    Baja California Sur The state is known for its natural riches and tourism. The Vizca?no Desert and small coastal lakes San Ignacio and Ojo de Liebre in the north are protected by the federal government....
  • Chihuahua
  • Nayarit
    Nayarit

    Nayarit is one of Political divisions of Mexico and is located on the central west coast, bordering the Pacific Ocean. Nayarit is surrounded by the states of Sinaloa to the northwest, Durango to the north, Zacatecas to the northeast and Jalisco to the south with the Pacific Ocean bordering it to the west....
    : Except from the Bahía de Banderas
    Bahía de Banderas

    Bah?a de Banderas is both a bay and a Municipalities of Mexico in the Mexico state of Nayarit.The bay, site of the tourist destination Puerto Vallarta, is bounded on the north by Punta Mita and on the south by Cabo Corrientes....
     municipality which uses the Central time zone.
  • Sinaloa
    Sinaloa

    Sinaloa is one of the 31 mexican state of Mexico....
  • Sonora
    Sonora

    Sonora is one of the 31 States of Mexico and is located in the northwest of the country....
    : always on MST - no daylight saving time
    Daylight saving time

    Daylight saving time is the convention of advancing clocks so that afternoons have more daylight and mornings have less. Typically clocks are adjusted forward one hour near the start of spring and are adjusted backward in autumn....
     like Arizona.
  • Revillagigedo Islands
    Revillagigedo Islands

    The Revillagigedo Islands are a group of four volcanic islands in the Pacific Ocean, known for their unique ecosystem. They have been part of Manzanillo, Colima Municipalities of Colima of the Mexico mexican state of Colima since 1861, but are nevertheless under Mexican federal jurisdiction, and lie 386 km southwest of Cabo San Luca...
     (Colima
    Colima

    Colima is a state in western Mexico. It shares its name with its capital and main city, Colima, Colima.Colima is a small state, sharing a border with the Mexican states of Jalisco to the north and east, and Michoac?n to the south....
    ): 3 of the 4 islands uses the Mountain Time Zone, Isla Socorro, San Benedicto Island
    San Benedicto Island

    San Benedicto, formerly Santo Tom?s, is the third largest island of the Revillagigedo Islands, located at .It is 4.8 km by 2.4 km in size, with an area 10 km?....
     and Roca Partida
    Roca Partida

    Roca Partida is the smallest of the Revillagigedo Islands in Mexico, administrated by the state of Colima. It is uninhabited, with an area of 1.4 Hectares only....
    .

United States

The following states or areas are part of the Mountain Time Zone:

  • Arizona
    Arizona

    The State of Arizona is a U.S. state located in the Southwestern United States of the United States. The capital and largest city is Phoenix, Arizona....
     - always on MST - no daylight saving time except in the Navajo Nation
    Navajo Nation

    The Navajo Nation is a semi-autonomy Native Americans in the United States homeland covering about 26,000 square miles , occupying all of northeastern Arizona, the southeastern portion of Utah, and northwestern New Mexico....
    .
  • New Mexico
    New Mexico

    New Mexico is a U. S. State located in the Southwestern United States of the United States. Inhabited by Native Americans in the United States populations for many centuries, it has also has been part of the Spanish Empire viceroyalty of New Spain, part of Mexico, and a U.S....
  • Wyoming
    Wyoming

    The State of Wyoming is a sparsely populated U.S. state in the Northwestern United States of the United States. The majority of the state is dominated by the mountain ranges and rangelands of the Rocky Mountains, while the easternmost section of the state is a high altitude prairie region known as the High Plains ....
  • Utah
    Utah

    The State of Utah is a western United States U.S. state of the United States. It was the List of U.S. states by date of statehood admitted to the United States on January 4, 1896....
  • Colorado
    Colorado

    The State of Colorado is a U.S. state located in the Mountain States of the United States of America. Colorado may also be considered to be a part of the Western United States and Southwestern United States regions of the United States....
  • Montana
    Montana

    Montana is a U.S. state in the Western United States. The western third of the state contains numerous mountain ranges; other 'island' ranges are found in the central third of the state, for a total of 77 named ranges of the Rocky Mountains....
  • Idaho
    Idaho

    The State of Idaho is a U.S. state in the Pacific Northwest region of the United States of America. The state's largest city and Capital is Boise, Idaho....
     (except northern panhandle)
  • Eastern Oregon/Malheur County
    Malheur County, Oregon

    Malheur County is a List of counties in Oregon located in the southeast corner of the U.S. state of Oregon. The Oregon Geographic Names for Malheur River, which flows through it....
  • the southwestern quadrant of North Dakota
    North Dakota

    North Dakota is a U.S. state located in the Midwestern United States and Western United States regions of the United States of America. North Dakota is the 19th largest state by area in the US; it is the 48th most populous, with just over 640,000 residents as of 2006....
  • the western half of South Dakota
    South Dakota

    South Dakota is a U.S. state located in the Midwestern United States of the United States of America. It is named after the Lakota people and Sioux Sioux Native Americans in the United States tribes....
  • the western third of Nebraska
    Nebraska

    Nebraska is a U.S. state located on the Great Plains of the Midwestern United States and Western United States.Nebraska probably gets its name from the archaic Chiwere language words ?? Br?sge or the Omaha-Ponca language N? Bth?ska meaning "flat water," after the Platte River that flows through the state....
  • the two westernmost counties in Texas
    Texas

    Texas is a U.S. state located in the South Central United States, nicknamed the Lone Star State. Texas is the second largest U.S. state in both area and population, spanning , and with a growing population of 24.3 million residents....
     (Hudspeth, El Paso
    El Paso County, Texas

    El Paso County is the westernmost county in the U.S. state of Texas. According to the 2007 U.S. Census population estimates, the county had a population of 755,085, up 75,463 from the 2000 Census....
    ) and a portion of Culberson County
    Culberson County, Texas

    Culberson County is a county located in the U.S. state of Texas. In 2000, its population was 2,975. It is named for David B. Culberson, a lawyer and Confederate States of America soldier in the American Civil War....
  • four counties in Kansas
    Kansas

    The State of Kansas is a Midwestern U.S. state in the Central United States of the United States of America, an area often referred to as the United States "Heartland"....
     (Greeley
    Greeley County, Kansas

    Greeley County is a U.S. county located in West Central Kansas, in the Central United States United States. The county's population was estimated to be 1,331 in the year 2006, making it the smallest in the state....
    , Hamilton
    Hamilton County, Kansas

    Hamilton County is a U.S. county located in Southwest Kansas, in the Central United States United States. The population was estimated to be 2,594 in the year 2006....
    , Sherman
    Sherman County, Kansas

    Sherman County is a county located in the U.S. state of Kansas. In 2000, its population was 6,760. Its county seat is Goodland, Kansas....
    , and Wallace
    Wallace County, Kansas

    Wallace County is a county located in the U.S. state of Kansas. As of 2000, the population was 1,749. It has the second lowest population of any county in Kansas....
    )
  • the Nevada
    Nevada

    Nevada is a U.S. state located in the Western United States of the United States of America. The capital is Carson City and the largest city is Las Vegas, Nevada....
     towns of West Wendover
    West Wendover, Nevada

    West Wendover is a city in Elko County, Nevada, Nevada, United States. The population was 4,721 at the United States Census 2000. It is part of the Elko, Nevada Elko micropolitan area....
     and Jackpot
    Jackpot, Nevada

    Jackpot is an unincorporated town in Elko County, Nevada, Nevada. In 2005 it was estimated to have a population of 1,416. Located less than 1 mile from the Idaho border on U.S....
  • the city of Kenton, Oklahoma
    Oklahoma

    Oklahoma is a U.S. state and a sovereignty located in the South Central United States and Southern United States of the United States of America ....


Arizona
Arizona

The State of Arizona is a U.S. state located in the Southwestern United States of the United States. The capital and largest city is Phoenix, Arizona....
 does not observe daylight saving time
Daylight saving time

Daylight saving time is the convention of advancing clocks so that afternoons have more daylight and mornings have less. Typically clocks are adjusted forward one hour near the start of spring and are adjusted backward in autumn....
. However, the Navajo Nation
Navajo Nation

The Navajo Nation is a semi-autonomy Native Americans in the United States homeland covering about 26,000 square miles , occupying all of northeastern Arizona, the southeastern portion of Utah, and northwestern New Mexico....
, the bulk of whose area is within Arizona, observes daylight saving time throughout its territory. The Hopi Reservation
Hopi Reservation

The Hopi Reservation, or simply Hopi, is a Native Americans in the United States reservation for the Hopi and Arizona Tewa people -- surrounded entirely by the Navajo Nation -- in Navajo County, Arizona and Coconino County, Arizona counties of Arizona, USA....
, an enclave inside the Navajo Nation, does not observe daylight saving time.

Zoneinfo

See also: List of zoneinfo time zones
US +394421-1045903 America/Denver ? US +433649-1161209 America/Boise south Idaho & east Oregon US +364708-1084111 America/Shiprock Navajo US +332654-1120424 America/Phoenix Arizona

Major metropolitan areas

    • Calgary, Alberta
      Calgary

      Calgary is the largest city in the province of Alberta, Canada. It is located in the south of the province, in an area of foothills and High Plains, approximately east of the front ranges of the Canadian Rockies....
  • Chihuahua, Chihuahua
    Chihuahua, Chihuahua

    The city of Chihuahua is the state capital of the Mexican Mexican state of Chihuahua . It has a population of about 748,551. The predominant activity is light industry, in the form of maquiladoras....
  • Ciudad Juárez, Chihuahua
  • Cranbrook, British Columbia
    Cranbrook, British Columbia

    Cranbrook, British Columbia is a city in southeast British Columbia, seat of the Regional District of East Kootenay, British Columbia. As of the Canada 2007 Census the population is 20,667, spread over an area of 25.14 square kilometres for a population density of 726.6 persons per square kilometre....
  • Edmonton, Alberta
    Edmonton

    Edmonton is the capital of the Canada Provinces and territories of Canada of Alberta. The city is located on the North Saskatchewan River in the central region of the province, an area with some of the most fertile farmland on the prairies....
    *Fort St. John, British Columbia
    Fort St. John, British Columbia

    The City of Fort St. John is a small city in northeastern British Columbia, Canada. A member municipality of the Peace River Regional District, British Columbia, the city covers an area of about 22 km? with 17,402 residents ....
     (no DST)
  • Front Range
    Front Range Urban Corridor

    The Front Range Urban Corridor is an oblong region of urban population located along the eastern face of the Rocky Mountains in the U.S. states of Colorado and Wyoming....
    , Colorado
    Colorado

    The State of Colorado is a U.S. state located in the Mountain States of the United States of America. Colorado may also be considered to be a part of the Western United States and Southwestern United States regions of the United States....
    /Wyoming
    Wyoming

    The State of Wyoming is a sparsely populated U.S. state in the Northwestern United States of the United States. The majority of the state is dominated by the mountain ranges and rangelands of the Rocky Mountains, while the easternmost section of the state is a high altitude prairie region known as the High Plains ....
     — north to south:*
    • Denver*
  • Hermosillo, Sonora (no DST)
  • La Paz, Baja California Sur
    La Paz, Baja California Sur

    La Paz is the capital city of the Mexico States of Mexico of Baja California Sur and an important regional commercial center. The city had a 2005 census population of 189,176 persons, but it can be considered that it roughly reaches 200,000 persons because of its surrounding towns like "el Centenario", "el Zacatal" and "San Pedro"....
  • (no DST)* (no DST)
  • Wasatch Front
    Wasatch Front

    The Wasatch Front is an urban area in the north-central part of the United States state of Utah. It consists of a chain of cities and towns stretched along the Wasatch Range from approximately Santaquin, Utah in the south to Brigham City, Utah in the north....
    , Utah
    Utah

    The State of Utah is a western United States U.S. state of the United States. It was the List of U.S. states by date of statehood admitted to the United States on January 4, 1896....
     — north to south:
    • Ogden
      Ogden, Utah

      Ogden is a city in and the county seat of Weber County, Utah, Utah, United States. The population was 81,605 according to 2005 United States Census Bureau estimates....
    • Salt Lake City
    • Orem
      Orem, Utah

      Orem is a city in Utah County, Utah, Utah, United States, in the north-central part of the state. It is adjacent to Provo, Utah, Lindon, Utah, and Vineyard, Utah and is about south of Salt Lake City, Utah....
    • Provo
      Provo, Utah

      Provo is a city in and the county seat of Utah County, Utah, Utah, United States, located about south of Salt Lake City, Utah along the Wasatch Front....

Sources