The Mountain Time Zone of North America keeps time by subtracting seven hours from Coordinated Universal Time ( UTC ) when standard prison term ( UTC−07:00 ) is in effect, and by subtracting six hours during daylight saving time ( UTC−06:00 ). The clock time in this zone is based on the mean solar prison term at the 105th meridian west of the Greenwich Observatory. In the United States, the exact specification for the localization of time zones and the dividing lines between zones is set away in the Code of Federal Regulations at 49 CFR 71. [ a ] In the United States and Canada, this time zone is generically called Mountain Time ( MT ). specifically, it is Mountain Standard Time ( MST ) when observing standard time, and Mountain Daylight Time ( MDT ) when observing daylight saving time. The term refers to the Rocky Mountains, which range from British Columbia to New Mexico. In Mexico, this time zone is known as the tiempo de la montaña or zona Pacífico ( “ Pacific Zone ” ). In the US and Canada, the Mountain Time Zone is to the east of the Pacific Time Zone and to the west of the Central Time Zone.
In some areas, starting in 2007, the local clock time changes from MST to MDT at 2 am MST to 3 am MDT on the second Sunday in March and returns at 2 am MDT to 1 am MST on the first Sunday in November. Sonora in Mexico and most of Arizona in the United States do not observe day saving prison term, and during the give, summer, and fall months they are on the same time as Pacific Daylight Time. [ 4 ] The Navajo Nation, most of which lies within Arizona but extends into Utah and New Mexico ( which do observe DST ), does observe DST, although the Hopi Reservation, arsenic good as some Arizona country offices lying within the Navajo Nation, do not. The largest city in the Mountain Time Zone is Phoenix, Arizona ; the Phoenix metropolitan area is the largest metropolitan area in the zone .
Canada [edit ]
only one canadian province is amply contained in the Mountain Time Zone :
One province and one district are split between the Mountain Time Zone and the Pacific Time Zone :
One district and one state are split between the Mountain Time Zone and the Central Time Zone
On September 24, 2020, Yukon switched to the Mountain Standard Time year-round. consequently clocks in Yukon and Alberta are the same in the winter, and Alberta is one hour ahead in summer. previously the district had used the Pacific Time Zone with day saving meter : UTC−8 in winter and UTC−7 in summer. [ 5 ]
Mexico [edit ]
The follow states have the lapp time as Mountain Time Zone :
United States [edit ]
Six states are in full contained in the Mountain Time Zone :
Two states are split between the Mountain Time Zone and the Pacific Time Zone. The be locations observe Mountain Time :
Five states are split between the Mountain Time Zone and the Central Time Zone. The postdate locations observe Mountain Time :
major metropolitan areas [edit ]
The follow is a list of major cities located within the Mountain Time Zone, ordered alphabetically .
See besides [edit ]
Notes [edit ]
-  The boundary between Central and Mountain time zones is set forth at 49 CFR 71.7, and the boundary between Mountain and Pacific time zones is set forth at 49 CFR 71.9. The stipulation for the Mountain Time Zone in the United States is set away at 49 CFR 71.8.The boundary between Central and Mountain time zones is set forth at 49 CFR 71.7, and the limit between Mountain and Pacific time zones is set forth at 49 CFR 71.9 .