Mountain Time Zone
The
Mountain Time Zone of
North America keeps time by subtracting seven hours from
Coordinated Universal Time (
UTC-7) during the short days of autumn, winter and spring), and by subtracting six hours during the
Daylight Saving days of spring, summer, and early autumn (
UTC-6).
The time observed in this zone is called
Mountain Standard Time (MST) when observing
standard time;
Mountain Daylight Time (MDT) when observing
daylight savings.
The zone is one hour ahead of the
Pacific Time Zone and one hour behind the
Central Time Zone.
In
Canada, Mountain Time is observed in the province of
Alberta, the
Northwest Territories (except for
Tungsten), the
Kitikmeot Region of
Nunavut and the part of
Saskatchewan immediately surrounding the city of
Lloydminster.
In
Mexico, Mountain Time covers the
states of
Baja California Sur,
Chihuahua,
Nayarit,
Sinaloa, and
Sonora. All these, with the exception of Sonora, observe DST from April to October.
In the
United States, the following
states are part of the Mountain Time Zone:
*
Arizona - always on MST - no
daylight saving except in Navajo reservation:*
New Mexico:*
Wyoming:*
Utah:*
Colorado:*
Montana:*
Idaho (except northern panhandle):*
Eastern Oregon/Malheur CountyAdditionally, the southwestern quadrant of
North Dakota, the western half of
South Dakota, the western third of
Nebraska, the two westernmost counties in
Texas, and the bulk of
Idaho are part of the Mountain Standard Time Zone. Four counties in
Kansas are part of the Mountain Standard Time Zone. Also, the greater part of
Malheur County, Oregon and the
Nevada town of
West Wendover is on Mountain Time.
Jackpot, Nevada observes Mountain Time unofficially because of close economic ties with southern Idaho. Although officially on Mountain Time,
Fort Pierre, South Dakota keeps Central Time because of its proximity to Pierre.
Arizona does not observe
Daylight Saving Time. However, the
Navajo Nation, the bulk of whose area is within Arizona, observes Daylight Saving Time throughout its territory.
*
Albuquerque, New Mexico*
Billings, Montana*
Boise, Idaho*
Calgary, Alberta*
Chihuahua, Chihuahua*
Ciudad Juárez, Chihuahua*
Colorado Springs, Colorado*
Denver, Colorado*
Edmonton, Alberta*
El Paso, Texas*
La Paz, Baja California Sur*
Phoenix, Arizona (no DST)
*
Salt Lake City, Utah*
Tucson, Arizona (no DST)
*
Time zone*
Hawaii-Aleutian Standard Time Zone*
Alaska Standard Time Zone*
Pacific Standard Time Zone*
Central Standard Time Zone*
Eastern Standard Time Zone*
Atlantic Standard Time Zone*
Newfoundland Standard Time Zone* http://www.travel.com.hk/region/timezone.htm
* http://geography.about.com/library/misc/ntimezones.htm
* http://aa.usno.navy.mil/faq/docs/us_tzones.html
* http://www.worldtimezone.com/time-canada12.html
* http://www.time.gov/timezone.cgi?Mountain/d/-7/java
