Most the the united state state of Arizona does not use Daylight saving Time (DST). The exception is the Navajo Nation.

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Most that Arizona has no Daylight conserving Time.

With the exemption of the Navajo Nation, Arizona walk not set the clocks forward 1 hour in spring for DST v the remainder of the unified States.

Mountain conventional Time

Almost all of Arizona is on the exact same time zone, hill Standard Time (MST), all year. The time zone has actually a UTC counter of minus 7 hours (UTC-7).

It is also known as mountain Time, but that term refers both to conventional time and the time zone i m sorry is somewhere else used throughout DST: hill Daylight Time (MDT).

Navajo nation Uses DST

The Navajo Nation, a semi-autonomous native American territory, complies with the United claims DST schedule. It lies in northeastern Arizona, northwestern brand-new Mexico, and southeastern Utah.


DST is provided in window Rock, Arizona, US.

During DST the Navajo Nation, which consists of the towns of Tuba City, Chinle, and home window Rock, to adjust the clocks forward 1 hour to hill Daylight Time (MDT), which is 6 hrs behind UTC (UTC-6).

No DST in Hopi Nation

A part of the Hopi Nation, i m sorry lies in ~ the Navajo Nation, follows Arizona"s no-DST rule. Come confuse matters more, over there is likewise an even smaller Navajo country territory within the Hopi country within the Navajo Nation. In addition to this, over there is an additional Hopi area adjacent to the main Hopi nation territory.

As a result, if driving the correct path from the Arizona state border v both Navajo and also Hopi areas to the other side one can end up changing one"s clock 7 times! for example: Tuba City (Navajo) and also Moenkopi (Hopi) are only a pair of mile apart, yet they have a 1-hour time distinction during the summer. Jeddito (Navajo), in the middle of Hopi nation territory, is 1 hour front of the surrounding locations during summer.

Opted the end of DST

Arizona is freed from DST follow to the US power Policy plot of 2005. The Act offers every state or territory the right to decision if it desires to use DST. If DST is observed, the state needs to schedule DST in sync with the remainder of the US: indigenous the second Sunday in March until the first Sunday in November.

Because of Arizona"s warm climate, DST is largely considered unnecessary. The argument versus extending the daylight hrs into the night is that people prefer to execute their tasks in the cooler night temperatures.

War Time DST

Arizona provided DST, together with the rest of the US, during world War ns in an initiative to maintain fuel because that the war. Likewise known as war Time, DST was supplied in Arizona indigenous March 31 come October 27, 1918.

At that time Arizona had 2 time zones. Communities in the far west of the state, close to California, provided Pacific Time when the remainder of Arizona observed hill Time.

Added 1 Hour During world War I

The state resources Phoenix and most of Arizona included 1 hour to hill Standard Time (MST) come what today is well-known as hill Daylight Time (MDT). Once the battle Time period ended many of Arizona, consisting of Phoenix, returned to MST.

The areas along the state’s west border included 1 hour come Pacific standard Time (PST) and used what is recognized today as Pacific Daylight Time (PDT). These areas returned to PST again.

The following year, Arizona joined the rest of the nation for battle Time native March 30 come October 26, 1919. Choose the year before, most of the state included 1 hour come MST, with the west border locations adding 1 hour come PST. The Yuma County communities in Arizona it was observed PDT native March 6, 1921 till October 30, 1921.

World battle II

In 1942, during civilization War II, president Franklin Delano Roosevelt introduced another duration of war Time, and also on February 9, 1942, most of Arizona moved to hill War Time, again through the couple of western border neighborhoods observing Pacific war Time.

But, on January 1, 1944 when many of Arizona returned to MST, the western border areas remained on Pacific battle Time, when railroads, airlines, bus lines, armed forces personnel, and interstate business continued come use mountain War Time in line with a commonwealth law.

Emergency Law

On April 1, 1944, an emergency regulation was pass to create Mountain Time and also Pacific Time as the state’s time zones. The law stated that DST was to be offered from April 1 to September 30. Federal offices and departments were exempt from the law. Because this law was an emergency measure, it came to be effective as soon as it to be signed.

There is some uncertainty as to what taken place next, but it seems that many of Arizona moved to hill War Time (equivalent to hill Daylight Time) on in march 17, 1944, also though the law shows that the state was to stay on mountain Standard Time until April 1, 1944, before transforming to hill War Time.

Return to conventional Time

On October 1, 1944, many of Arizona changed to hill Standard Time (MST), while most of the Mohave County region changed to Pacific traditional Time (PST). Most parts of the state remained on MST till the mid-1960s.

In 1966, the us Congress happen the Uniform Time Act, which collection a schedule for DST. It to be still up to local jurisdictions to decision if DST was to be used. In 1967, Arizona it was observed DST native the critical Sunday of April to the critical Sunday that October. Top top October 29 the year, it complied with the remainder of the country in return to conventional time. Indigenous that allude onwards, most parts that the state continued to be on MST.

DST Unpopular in Arizona

The DST attempt in 1967 provoked for this reason many an adverse reactions the DST was never ever used again. People in Arizona, including plenty of businesses, farming communities, and also parents, desired to continue to be on hill Standard Time transparent the year claiming the DST developed no benefits for them.

Most people thought that DST was not necessary given Arizona"s warm climate, and also cooler evenings to be a benefit.

However, part businesses operating interstate complained that they had to keep reminding various other states that Arizona doesn"t have DST.

The DST debate

Arizona top top MST, no PDT

There is a usual misconception that Arizona is ~ above Pacific Daylight Time (PDT) during the summer and also on hill Standard Time (MST) during the winter. Because MST and PDT have the very same UTC offset of minus 7 hours (UTC-7), Arizona has the same neighborhood time as neighboring states California and also Nevada during the summer season.

Although the time is the same, Arizona uses standard time (MST) every year. “Daylight” time zones, such together MDT, are mostly used for locations that switch to DST every year.

DST in the US

Hawaii is the only US state the does not usage DST in ~ all.

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None of the united state dependencies watch DST. This contains American Samoa, Guam, Puerto Rico, north Mariana Islands, the united state Minor outlying Islands, and also the united state Virgin Islands.