The Mountain Time Zone of North America keeps time by subtracting seven hours from Coordinated Universal Time, sometimes called Greenwich Mean Time during the shortest days of autumn and winter, and by subtracting six hours during daylight saving time in the spring, summer, and early autumn. The clock time in this zone is based on the mean solar time of the 105th meridian west of the Greenwich Observatory. In the United States and Canada, this time zone is generically called Mountain Time (MT).

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  • The Mountain Time Zone of North America keeps time by subtracting seven hours from Coordinated Universal Time, sometimes called Greenwich Mean Time during the shortest days of autumn and winter, and by subtracting six hours during daylight saving time in the spring, summer, and early autumn. The clock time in this zone is based on the mean solar time of the 105th meridian west of the Greenwich Observatory. 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. In Mexico this time is known as the Pacific Zone. In the USA, the exact specification for the location of time zones and the dividing line between zones is set forth in the Code of Federal Regulations at 49 CFR 71. The zone is one hour ahead of the Pacific Time Zone and one hour behind the Central Time Zone. 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. Most of Arizona does not observe daylight savings time, and during summer months is on the same time as Pacific Daylight Time, though it is still called Mountain Standard Time in Arizona. The Navajo Nation, most of which lies within Arizona, does observe daylight savings time, although the Hopi Nation (as well as some Arizona state offices) lying within the Navajo Nation do not. The largest city in the Mountain Time Zone is Phoenix, Arizona. 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 .
  • El Tiempo de la Montaña o Zona Pacífico es el huso horario oficial correspondiente en México al UTC -7, es decir, siete horas menos que en el Tiempo Universal Coordinado o UTC, también conocido como horario GMT.
  • L'heure des Rocheuses (en anglais Mountain Time Zone) est un fuseau horaire couvrant une bande de terre de l'Amérique du Nord correspondant environ aux Montagnes Rocheuses. Au Canada et aux États-Unis, il correspond en hiver à l'heure normale des Rocheuses, en anglais Mountain Standard Time (MST), soit UTC-7, et en été à l'heure avancée des Rocheuses, en anglais Mountain Daylight Time (MDT), soit UTC-6. Le Uniform Time Act de 1966 aux États-Unis, fixait la date du changement d'heure au dernier dimanche d'avril pour la majorité du territoire américain, avec un retour à l'heure normale le dernier dimanche d'octobre. En 1987, une modification de la loi change la date du passage à l'heure avancée au premier dimanche d'avril. Depuis le 11 mars 2007, le Energy Policy Act of 2005 rallonge la période de l'heure avancée aux États-Unis, qui s'étend maintenant du deuxième dimanche de mars au premier dimanche de novembre. Au Canada, la réglementation de l'heure légale est de juridiction provinciale. Les provinces canadiennes suivent en général les pratiques des états américains limitrophes afin de faciliter le commerce entre les deux pays.
  • 山岳部標準時（さんがくぶひょうじゅんじ、 Mountain Standard Time: 略称MST）は、協定世界時 (UTC) を7時間遅らせた標準時である。「-0700(MST)」のように表示する。 なお、夏時間では協定世界時より6時間遅れ、山岳部夏時間（Mountain Daylight Time: 略称MDT）と呼ばれている。
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  • The Mountain Time Zone of North America keeps time by subtracting seven hours from Coordinated Universal Time, sometimes called Greenwich Mean Time during the shortest days of autumn and winter, and by subtracting six hours during daylight saving time in the spring, summer, and early autumn. The clock time in this zone is based on the mean solar time of the 105th meridian west of the Greenwich Observatory. In the United States and Canada, this time zone is generically called Mountain Time (MT).
  • El Tiempo de la Montaña o Zona Pacífico es el huso horario oficial correspondiente en México al UTC -7, es decir, siete horas menos que en el Tiempo Universal Coordinado o UTC, también conocido como horario GMT.
  • L'heure des Rocheuses (en anglais Mountain Time Zone) est un fuseau horaire couvrant une bande de terre de l'Amérique du Nord correspondant environ aux Montagnes Rocheuses. Au Canada et aux États-Unis, il correspond en hiver à l'heure normale des Rocheuses, en anglais Mountain Standard Time (MST), soit UTC-7, et en été à l'heure avancée des Rocheuses, en anglais Mountain Daylight Time (MDT), soit UTC-6.
  • 山岳部標準時（さんがくぶひょうじゅんじ、 Mountain Standard Time: 略称MST）は、協定世界時 (UTC) を7時間遅らせた標準時である。「-0700(MST)」のように表示する。 なお、夏時間では協定世界時より6時間遅れ、山岳部夏時間（Mountain Daylight Time: 略称MDT）と呼ばれている。
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  • Mountain Time Zone
  • Tiempo de la Montaña
  • Heure des Rocheuses
  • 山岳部標準時
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