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The Pacific Time Zone ( PT) is a time zone encompassing parts of western Canada, the western United States, and western Mexico. Places in this zone observe standard time by subtracting eight hours from Coordinated Universal Time ( UTC−08:00 ). During daylight saving time, a time offset of UTC−07:00 is used.
Prior to 1983, the current Alaska Time Zone (UTC−09:00) was known as the Yukon Time Zone, observing Yukon Standard Time (YST). This time zone included Canada's Yukon Territory and a small portion of Alaska including Yakutat. The Alaska Panhandle communities were in the Pacific Time Zone, while most of the interior was on UTC−10:00. [6]
In 1900, "Alaska Standard Time" was established within the state as UTC−09:00. In 1918, the United States Congress passed the Standard Time Act, which defined a standard time zone for Alaska - United States Standard Alaska Time, set at UTC−10:00. On January 20, 1942, all of the United States, including Alaska, began to observe War Time.
The Hawaii–Aleutian Time Zone observes Hawaii–Aleutian Standard Time (HST) [1] [2] by subtracting ten hours from Coordinated Universal Time ( UTC−10:00 ). The clock time in this zone is based on the mean solar time of the 150th meridian west of the Greenwich Observatory . The zone takes its name from the two areas it includes: Hawaii and ...
Now there is a multistate effort to instead make Pacific Standard Time permanent. California, Idaho, Oregon and Washington all recently introduced similar concepts . Moving to Pacific Standard ...
The evolution of United States standard time zone boundaries from 1919 to 2024 in five-year increments. Plaque in Chicago marking the creation of the four time zones of the continental US in 1883 Colorized 1913 time zone map of the United States, showing boundaries very different from today Map of U.S. time zones during between April 2, 2006, and March 11, 2007.
Each time zone is defined by a standard offset from Coordinated Universal Time (UTC). The offsets range from UTC−12:00 to UTC+14:00, and are usually a whole number of hours, but a few zones are offset by an additional 30 or 45 minutes, such as in India and Nepal.
This is a list of the UTC time offsets, showing the difference in hours and minutes from Coordinated Universal Time (UTC), from the westernmost (−12:00) to the easternmost (+14:00). It includes countries and regions that observe them during standard time or year-round. The main purpose of this page is to list the current standard time offsets ...