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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.
Daylight saving time (DST), also referred to as daylight saving(s), daylight savings time, daylight time (United States and Canada), or summer time (United Kingdom, European Union, and others), is the practice of advancing clocks to make better use of the longer daylight available during summer, so that darkness falls at a later clock time.
The Uniform Time Act of 1966 established the system of uniform daylight saving time throughout the US. [1] In the U.S., daylight saving time starts on the second Sunday in March and ends on the first Sunday in November, with the time changes taking place at 2:00 a.m. local time. With a mnemonic word play referring to seasons, clocks "spring ...
Two subsequent amendments, in 1986 and 2005, have shifted these days so that daylight saving time now runs from the second Sunday in March until the first Sunday in November. Arizona time: Year-round Mountain Standard Time (red) and DST (yellow) Arizona and Hawaii use standard time throughout the year. However:
Current time. 16:52, 15 May 2024 EST [ refresh] 17:52, 15 May 2024 EDT [ refresh] Observance of DST. DST is observed in parts of this time zone. The Eastern Time Zone ( ET) is a time zone encompassing part or all of 23 states in the eastern part of the United States, parts of eastern Canada, and the state of Quintana Roo in Mexico .
The Mountain Time Zone of North America keeps time by subtracting seven hours from Coordinated Universal Time (UTC) when standard time ( UTC−07:00) is in effect, and by subtracting six hours during daylight saving time ( UTC−06:00 ). The clock time in this zone is based on the mean solar time at the 105th meridian west of the Greenwich ...
List of tz database time zones. The tz database partitions the world into regions where local clocks all show the same time. This map was made by combining version 2023d with OpenStreetMap data, using open source software. [1] This is a list of time zones from release 2024a of the tz database. [2]
Date-time group. In communications messages, a date-time group ( DTG) is a set of characters, usually in a prescribed format, used to express the year, the month, the day of the month, the hour of the day, the minute of the hour, and the time zone, if different from Coordinated Universal Time (UTC). [citation needed]