The Pacific Time Zone observes standard time by subtracting eight hours from Coordinated Universal Time (UTC-8). UTC−8 is a band of Timezones separated from the Universal Coordinated Time by 8 hours Standard time is the result of synchronizing clocks in different geographical locations within a Time zone to the same time rather than using the local meridian as UTC−8 is a band of Timezones separated from the Universal Coordinated Time by 8 hours The clock time in this zone is based on the mean solar time of the 120th degree meridian west of the Greenwich Observatory. Solar times are measures of the apparent position of the Sun on the Celestial sphere. This article is about the geographical concept For other uses of the word see Meridian. The Royal Observatory Greenwich (formerly the Royal Greenwich Observatory or RGO) was commissioned in 1675 by King Charles II, with the During daylight saving time, its time offset is UTC-7. Daylight saving time ( DST A time offset is defined by international convention as a number of hours and minutes from Coordinated Universal Time in Greenwich England. UTC−7 can be observed in Mountain Standard Time Zone Pacific Daylight Time Zone Canada

In the United States and Canada, this time zone is generically called Pacific Time (PT). The United States of America —commonly referred to as the Country to "Dominion of Canada" or "Canadian Federation" or anything else please read the Talk Page Specifically, it is Pacific Standard Time (PST) when observing standard time (Winter), and Pacific Daylight Time (PDT) when observing daylight saving time (Summer). Winter is one of the four Seasons of Temperate zones Calculated astronomically, it begins on the Solstice and ends on the Equinox Summer is one of the four Temperate Seasons Summer marks the warmest time of year with the longest days In Mexico this time is known as the Northwest Zone. The United Mexican States ( or commonly Mexico (ˈmɛksɪkoʊ () is a federal constitutional Republic in North America.

The zone is one hour ahead of the Alaska Time Zone, one hour behind the Mountain Time Zone and three hours behind the Eastern Time Zone. The Alaska Time Zone observes Standard time by subtracting nine hours from Coordinated Universal Time ( UTC-9) The Mountain Time Zone of North America keeps time by subtracting seven hours from Coordinated Universal Time ( UTC-7) during the shortest days of autumn The Eastern Time Zone ( ET) of the Western Hemisphere falls mostly along the east coast of North America and the west coast of South America

In the United States, the states of Washington and California are located entirely within the Pacific Time Zone. The United States of America —commonly referred to as the Washington ( is a state in the Pacific Northwest region of the United States. California ( is a US state on the West Coast of the United States, along the Pacific Ocean. Nearly all of Nevada, except for the towns of West Wendover and Jackpot, is on Pacific Time. Nevada ( is a state located in the western region of the United States of America. West Wendover is a city in Elko County, Nevada, United States. Jackpot is an unincorporated town in Elko County, Nevada. In 2005 it was estimated to have a population Additionally, the northern part of Idaho (the Idaho Panhandle) and all of Oregon except for the greater part of Malheur County are also in the zone. The State of Idaho ( is a state in the Pacific Northwest region of the United States of America. The Idaho Panhandle is the northern region of the US State of Idaho that encompasses the ten northernmost counties of Benewah, Bonner Oregon ( is a state in the Pacific Northwest region of the United States. Malheur County (mælˈhɪər is a county located in the southeast corner of the U The exact specification for the location of time zones and the dividing line between zones is set forth in the Code of Federal Regulations at 49 CFR 71. The Code of Federal Regulations (CFR is the codification of the general and permanent rules and regulations (sometimes called administrative law) published in the ^[1]

In Canada, PST includes almost all of the province of British Columbia (except for the Highway 95 corridor and portions around Fort St. John and Dawson Creek), all of the Yukon Territory and Tungsten, Northwest Territories. Country to "Dominion of Canada" or "Canadian Federation" or anything else please read the Talk Page British Columbia (ˌbrɪtɨʃ kəˈlʌmbiə ( BC) ( (la Colombie-Britannique C Highway 95 in British Columbia, the Columbia Highway, is a north-south highway in the southeastern corner of the province opened in 1957. The City of Dawson Creek is a small city in northeastern British Columbia, Canada. Yukon (ˈjuːkɒn is the westernmost and smallest of Canada's three territories. The townsite of Tungsten is located at Cantung Mine in the Northwest Territories. The Northwest Territories (ˌnɔrθˌwɛstˈtɛrɨtɔriz ( NWT or NT; French, les Territoires du Nord-Ouest) is a territory

In Mexico, the state of Baja California is wholly within and the only part of Mexico in PST. The United Mexican States ( or commonly Mexico (ˈmɛksɪkoʊ () is a federal constitutional Republic in North America. Baja California (pronounced ˈbɑːhɑː kælɨˈfɔrnjə in English is the northernmost state of Mexico. Also the westernmost of the Revillagigedo Islands (Colima), Clarion Island uses the Pacific Time Zone. The Revillagigedo Islands (also Revillagigedo Archipelago or Islas Revillagigedo) are a group of four Volcanic islands Islands in the For the state capital of the same name see Colima Colima. There is also a volcano named Colima, and a spider genus Colima ( Zodariidae Isla Clarión, formerly called Santa Rosa, is the second largest westernmost and most remote of the Revillagigedo Islands, 314 km west of Socorro Island

Most of the Pacific Time zone observes Pacific Daylight Time (PDT, UTC-7) during the summer months, with the exception of the areas surrounding Dawson Creek and Creston in British Columbia. UTC−7 can be observed in Mountain Standard Time Zone Pacific Daylight Time Zone Canada The City of Dawson Creek is a small city in northeastern British Columbia, Canada. Creston is a town of 4826 people in the Kootenay region of southeastern British Columbia, Canada. British Columbia (ˌbrɪtɨʃ kəˈlʌmbiə ( BC) ( (la Colombie-Britannique C Also, during summer months, most of Arizona, which is in the Mountain time zone but does not observe DST, is on the same time as neighboring states to the west which are on Pacific daylight time. The State of Arizona ( is a state located in the southwestern region of the United States.

Through 2006, the local time (PST, UTC-8) changed to PDT (UTC-7) at 02:00 LST (local standard time) to 03:00 LDT (local daylight time) on the first Sunday in April, and returned at 02:00 LDT to 01:00 LST on the last Sunday in October.

Effective 2007, the local time changes from PST to PDT at 02:00 LST to 03:00 LDT on the second Sunday in March and returns at 02:00 LDT to 01:00 LST on the first Sunday in November, except in Mexico, where the previous dates are still in effect.

Major cities

A rough estimation of the population of the entire time zone is 53,462,949. That is, the populations of Washington, Oregon, Nevada, California, Baja California, British Columbia, and Yukon Territory combined. Washington ( is a state in the Pacific Northwest region of the United States. Oregon ( is a state in the Pacific Northwest region of the United States. Nevada ( is a state located in the western region of the United States of America. California ( is a US state on the West Coast of the United States, along the Pacific Ocean. Baja California (pronounced ˈbɑːhɑː kælɨˈfɔrnjə in English is the northernmost state of Mexico. British Columbia (ˌbrɪtɨʃ kəˈlʌmbiə ( BC) ( (la Colombie-Britannique C Yukon (ˈjuːkɒn is the westernmost and smallest of Canada's three territories.

Over 1,000,000 residents

• Los Angeles, California, USA
• San Diego, California, USA
• Tijuana, Baja California, Mexico

Over 700,000 residents

• San Francisco, California, USA
• San Jose, California, USA
• Mexicali, Baja California, Mexico

Over 400,000 residents

• Fresno, California, USA
• Las Vegas, Nevada, USA
• Long Beach, California, USA
• Oakland, California, USA
• Portland, Oregon, USA
• Seattle, Washington, USA
• Sacramento, California, USA
• Vancouver, British Columbia, Canada

Over 200,000 residents

• Anaheim, California, USA
• Bakersfield, California, USA
• Ensenada, Baja California, Mexico
• Fremont, California, USA
• Henderson, Nevada, USA
• Modesto, California, USA
• Reno, Nevada, USA
• Riverside, California, USA
• Santa Ana, California, USA
• Spokane, Washington, USA
• Stockton, California, USA
• Tacoma, Washington, USA
• Victoria, British Columbia, Canada

References

Sources

• The official U.S. time for the Pacific Time Zone
• Official times across Canada
• World time zone map
• U.S. time zone map
• History of U.S. time zones and UTC conversion
• Canada time zone map
• Time zones for major world cities
• PST Pacific Standard Time

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