Daylight Saving Time is observed in the Mountain Time Zone, but where does it start?

The Mountain Time Zone of North America keeps time by subtracting seven hours from Coordinated Universal Time (UTC) when standard time is in effect and six hours during daylight saving time.The clock time in this zone is based on the solar time at the 105th meridian.The exact specification for the location of time zones and the dividing lines between zones is in the Code of Federal Regulations.A]

The time zone in the United States and Canada is called Mountain Time.Mountain Standard Time and Mountain Daylight Time are used when observing daylight saving time.The mountains range from British Columbia to New Mexico.The Pacific Zone is known in Mexico as the tiempo de la montaa.In the US and Canada, the Mountain Time Zone is to the east and west of the Pacific and Central Time Zones.

On the second Sunday of March and the first Sunday in November, the local time changes from MST to MDT at 2 am to 3 am and then back to it at 1 am.

Daylight saving time is not observed in Sonora in Mexico and most of Arizona in the United States during the spring, summer, and autumn months.Although the Hopi Reservation and some Arizona state offices do not observe Daylight Saving Time, the Navajo Nation, most of which lies within Arizona but extends into Utah and New Mexico, does.

Phoenix is the largest metropolitan area in the Mountain Time Zone.