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Time in Arizona, as in all U.S. states, is regulated by the United States Department of Transportation [1] as well as by state and tribal law. All of Arizona is in the Mountain Time Zone . [ 2 ] Since 1968, most of the state—except the Navajo Nation —does not observe daylight saving time and remains on Mountain Standard Time (MST) all year.
This is a list of the time offsets by U.S. states, federal district, and territories. For more about the time zones of the U.S. see time in the United States. Most states are entirely contained within one time zone. However, some states are in two time zones, due to geographical, socio-political or economic reasons.
UTC−08:00 (Zone 4 or Northwest Zone) – State of Baja California UTC−07:00 (Zone 3 or Pacific Zone) – States of Baja California Sur, Chihuahua, Nayarit, Sinaloa and Sonora UTC−06:00 (Zone 2 or Central Zone) – Most of Mexico UTC−05:00 (Zone 1 or Southeast Zone) – State of Quintana Roo: Time in Mexico: Chile: 3: UTC−06:00 ...
The clock time in this zone is based on the mean solar time at the 105th meridian west of the Greenwich Observatory. In the United States, the exact specification for the location of time zones and the dividing lines between zones is set forth in the Code of Federal Regulations at 49 CFR 71.
(See map inset right.) In 2005, Indiana passed legislation that took effect on April 2, 2006, that placed the entire state on daylight saving time (see Time in Indiana). Before then, Indiana officially used standard time year-round, with the following exceptions: The portions of Indiana that were on Central Time observed daylight saving time.
Arizona (except the Navajo Nation) and Hawaii do not observe DST. [8] Year-round DST observed in 1942–1945 and 1974–1975. Uruguay: 2015: Observed DST in 1923–1926, 1933–1943, 1959–1960, 1965–1970, 1972, 1974–1980, 1987–1993, and 2004–2015. [17] Uzbekistan: 1991: Observed DST in 1981–1991. Vanuatu: 1993: Observed DST in 1983 ...
Time zones of the world. A time zone is an area which observes a uniform standard time for legal, commercial and social purposes. Time zones tend to follow the boundaries between countries and their subdivisions instead of strictly following longitude, because it is convenient for areas in frequent communication to keep the same time.
Whether the 24-hour clock, 12-hour clock, or 6-hour clock is used. Whether the minutes (or fraction of an hour) after the previous hour or until the following hour is used in spoken language. The punctuation used to separate elements in all-numeric dates and times. Which days are considered the weekend.