Pacific Time Zone

The Pacific Time Zone recognizes a standard time by adjusting their clocks eight hours backwards from Coordinated Universal Time resulting in the commonly used term UTC – 08:00. The clock time in the Pacific Time zone is primarily founded on the principles governing the mean solar time of the 120th meridian west of the London Greenwich Observatory.

Territories which fall within The Pacific Time zone when observing daylight saving time have their time offset by adjusting their clocks backwards by seven hours to become UTC – 07:00 and is supported by the mean solar time of the 105th meridian west of the London based Greenwich Observatory.

Throughout the United States and Canadian provinces, territories observing the Pacific Time zone are generally accustomed to referring to their time as falling within the Pacific Time Zone or PTZ. And regions which are known to observe daylight saving time are known to refer to the Pacific Time as a Pacific Standard Time. Pacific Time during mid-fall through to late winter is known as just Pacific Time and is recognized as Pacific Daylight Time – Mountain Time when observing daylight savings during the late winter through to the mid-fall season.

Daylight Saving Time for the Pacific Time Zone

Local time Pacific Standard Time UTC – 08:00 through 2006 was changed to daylight saving time Pacific Daylight Time UTC – 07:00 at 02:00 am local standard time to 03:00 local daylight time on the first Sunday in the month of April and changed back at 02:00 local daylight time to 01:00 local standard time on the last Sunday occurring in the month of October.

The Energy Policy Act of 2005 which became effective in the United States in 2007 as form of amendment to the Uniform Time act of 1966. The Uniform Time Act of 1966 which was enacted on April 13, 1966 was set forth as a federal law in the United States to promote the adoption of a unified time within the standard time zones as suggested by the 1918 Standard Time Act. This policy resulted in a change from Pacific Standard Time to Pacific Daylight Time at 02:00 local standard time to 03:00 local daylight time beginning on the second Sunday in the month of March ending at 02:00 local daylight time with the clocks returning to 01:00 local standard time on the first Sunday in the month of November.

Canada would eventually adopt this change to their local time. In the beginning of 2101 a part of Mexico was seen using extended dates of the Pacific Time Zone, however most of Mexico to date has been found to still uses the old dates.

Many of the Canadian provinces are known to observe a time based on the Pacific Time Zone while recognizing daylight savings time. In Mexico the Pacific Time zone is generally known as the Northwest Zone and maintains its time by synchronizing its clocks with the United States PDT daylight saving plan.

To date the largest city within the United States falling under the Pacific Tome Zone, is the city of Los Angeles in the state of California with the city’s metropolitan area recognized as the largest in the zone.

Clocks governed by the Pacific Time Zone are generally found to be one hour ahead of the Alaskan Time Zone, three hours behind Eastern Time and one hour behind clocks observing a Mountain Time Zone.

Pacific Time in The United States

States within the United States which fall within the Pacific Time Zone include:


With the exception of Malheur County which borders Idaho on the dividing line which runs through the southwest township corner, the entire state of Oregon observes a Pacific Time.


All of the state of Nevada with the exception of the West Wendover border town neighboring the state of Utah which is known for adopting a Mountain Time; legally recognizes the Pacific Time Zone. However the towns of Jarbridge, Jackpot, Owyhee and Mountain City although legally falling within the Pacific Time Zone, due to their close affiliation with the connecting towns within the state of Idaho have chosen to locally adopt a Mountain Time.


The northern half of the state of Idaho north of the Salmon River legally recognizes the Pacific Time Zone.

Although the state of Arizona falls within the Mountain Time Zone, most territories within the state do not observe daylight saving time. The result of which is; most of the Arizona state observing a Mountain Standard Time which synchronizes with a Pacific Daylight Time during the months of spring, summer and autumn. The Navajo Nation which stretches across much of Arizona does not observe a time based on daylight saving time contrary to the Hopi Nation and a few Arizona state offices found within the Navajo Nation.

The town of Hyder which is found in the state of Alaska officially falls within the Alaska Time Zone. However most of the town has been found to observe Pacific Time due to the fact that a large portion of its community is dependent on the neighboring district municipality at the head of the Portland Canal in northwest British Columbia, Canada which falls within the Pacific Time Zone. Notably the United States Postal Office located within the town of Hyder formally conforms to Alaska Time.

Other territories within the United States known for using Pacific Time include the states of California and Washington.

Pacific Time in Canada

Throughout Canada, Pacific Time is used by almost all of the province known as British Columbia with the exception of the neighboring regions around Creston, Dawson Creek, Fort St. John, Golden and Tumbler Ridge. Canada’s Northwest Territories, Tungsten and Yukon are all known to observe a Pacific Time.

Pacific Time in Mexico

The entire state of Baja, California in Mexico is the only territory within Mexico which falls within the Pacific Time Zone. However the most western territories of the Clarion Island and the Revillagigedo Islands found within the state of Colima located in the Western Mexico region on Mexico’s central Pacific coast are known to use use a Mountain Standard Time.