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Mountain Time Zone

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Mountain Time Zone
Time zone
Mountain Time Zone
UTC offset
MSTUTC−07:00
MDTUTC−06:00
Current time
09:03, July 5, 2024MST[refresh]
10:03, July 5, 2024MDT[refresh]
Observance ofDST
DST is observed in some of this time zone.

TheMountain Time ZoneofNorth Americakeeps time by subtracting seven hours fromCoordinated Universal Time(UTC) whenstandard time(UTC−07:00) is in effect, and by subtracting six hours duringdaylight saving time(UTC−06:00). The clock time in this zone is based on themean solar timeat the105th meridian westof theGreenwich Observatory.In the United States, the exact specification for the location oftime zonesand the dividing lines between zones is set forth in theCode of Federal Regulationsat 49 CFR 71.[a]

In the United States and Canada, this time zone is generically calledMountain Time(MT). Specifically, it isMountain Standard Time(MST) when observing standard time, andMountain Daylight Time(MDT) when observing daylight saving time. The term refers to theRocky Mountains,which range fromBritish ColumbiatoNew Mexico.In Mexico, this time zone is known as thetiempo de la montañaorzona Pacífico( "Pacific Zone" ). In the United States and Canada, the Mountain Time Zone is to the east of thePacific Time Zoneand to the west of theCentral Time Zone.

In some areas, starting in 2007, the local time changes from MST to MDT at 2am MST to 3am MDT on the second Sunday in March and returns at 2am MDT to 1am MST on the first Sunday in November.

Sonorain Mexico and most ofArizonain the United States do not observe daylight saving time (DST), and during the spring, summer, and autumn months they are on the same time asPacific Daylight Time.[4]TheNavajo Nation,most of which lies within Arizona but extends into Utah and New Mexico (which do observe DST), does observe DST, although theHopi Reservation,as well as some Arizona state offices lying within the Navajo Nation, do not.

The largest city in the Mountain Time Zone isPhoenix, Arizona;thePhoenix metropolitan areais the largest metropolitan area in the zone.

Canada[edit]

Main article:Time in Canada

One province and two territories are fully contained in the Mountain Time Zone:

On September 24, 2020, Yukon switched to the Mountain Standard Time year-round. Therefore, clocks in Yukon and Alberta are the same in the winter, and Alberta is one hour ahead in summer. Previously, the territory had used the Pacific Time Zone with daylight saving time: UTC−8 in winter and UTC−7 in summer.[5]

One province and one territory are split between the Mountain Time Zone and thePacific Time Zone:

One territory and one province are split between the Mountain Time Zone and theCentral Time Zone:

Mexico[edit]

Main article:Time in Mexico

As of October 30, 2022, Mexico abandoneddaylight savings time,with certain exceptions. The followingstateshave the same time as Mountain Time Zone:

United States[edit]

Main article:Time in the United States

Six states are fully contained in the Mountain Time Zone:

Three states are split between the Mountain Time Zone and thePacific Time Zone.The following locations observe Mountain Time:

Five states are split between the Mountain Time Zone and theCentral Time Zone.The following locations observe Mountain Time:

Major metropolitan areas[edit]

Alphabetical list of major cities located within the Mountain Time Zone. Cities inbolddo not observe daylight saving time:

See also[edit]

Notes[edit]

  1. ^The specification for the Mountain Time Zone in the United States is set forth at 49 CFR 71.8.[1]The boundary between Central and Mountain time zones is set forth at 49 CFR 71.7,[2]and the boundary between Mountain and Pacific time zones is set forth at 49 CFR 71.9.[3]

References[edit]

  1. ^"49 CFR 71.8 Mountain zone".Code of Federal Regulations.RetrievedOctober 7,2011.
  2. ^"49 CFR 71.7 Boundary line between central and mountain zones".Code of Federal Regulations.RetrievedOctober 7,2011.
  3. ^"49 CFR 71.9 Boundary line between mountain and Pacific zones".Code of Federal Regulations.RetrievedOctober 7,2011.
  4. ^Robbins, Ted (March 11, 2007)."Arizona Says No to Daylight-Saving Time".Weekend Edition Sunday.National Public Radio.RetrievedJune 18,2012.
  5. ^"HOME - Yukon Legislation".Yukon Legislation.RetrievedFebruary 16,2022.

External links[edit]

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