TheMountain Time Zone subtracts seven hours fromUTC duringstandard time (UTC−7) and six hours duringdaylight saving time (UTC−6).
Thistime zone is calledMountain Standard Time (MST) during standard time (Winter). It is calledMountain Daylight Time (MDT) during daylight saving time (Summer). In theUnited States andCanada, this time zone is often just calledMountain Time (MT).
The zone is one hour ahead of thePacific Time Zone and one hour behind theCentral Time Zone. The largest city in the Mountain Time Zone isPhoenix, Arizona. The Phoenix Metropolitan Area is the largest metro area in the zone.
InCanada, this time zone includes all ofAlberta, theNorthwest Territories (except forTungsten), theKitikmeot Region ofNunavut, part of southeastern and northeasternBritish Columbia, and the area ofSaskatchewan around the city ofLloydminster.
In theUnited States, the time zone includes the entire area of the states ofNew Mexico,Wyoming,Utah,Colorado, andMontana. It also includes parts ofIdaho,Oregon,North Dakota,South Dakota,Nebraska,Texas,Kansas, andNevada.
Thesestates are part of the Mountain Time Zone:Baja California Sur,Chihuahua,Nayarit,Sinaloa,Sonora.
Daylight saving time occurs from early April to late October. During daylight saving, Central Time Zone is only 6 hours behind Coordinated Universal Time (UTC−6). Most of the locations in Mountain Time Zone observe daylight saving time. A few places do not. These include Sonora and all of Arizona that is not in theNavajo Nation. These places stay on standard time all year.