- Pacific Time Zone
The Pacific Time Zone observes
standard timeby subtracting eight hours from Coordinated Universal Time( UTC-8). The clock time in this zone is based on the mean solar timeof the 120th degree meridian west of the Greenwich Observatory. During daylight saving time, its time offsetis UTC-7.
United Statesand Canada, this time zone is generically called Pacific Time (PT). Specifically, it is Pacific Standard Time (PST) when observing standard time ( Winter), and Pacific Daylight Time (PDT) when observing daylight saving time ( Summer). Canada follows United States daylight time. In Mexicothe UTC-8 time zone is known as the "Northwest Zone" (Zona Noroeste), which formerly was synchronized with the U.S. PDT daylight saving schedule.
The zone is one hour ahead of the
Alaska Time Zone, one hour behind the Mountain Time Zoneand three hours behind the Eastern Time Zone.
United States, the states of Washingtonand Californiaare located entirely within the Pacific Time Zone. Nearly all of Nevada, except for the towns of West Wendover and Jackpot, is on Pacific Time. Additionally, all of Oregonexcept for the greater part of Malheur County and the northern part of Idaho(the Idaho Panhandle) are also in the zone. The exact specification for the location of time zones and the dividing line between zones is set forth in the Code of Federal Regulationsat 49 CFR 71. [The specification for the Pacific Time Zone as it pertains to the United States is set forth at 49 CFR 71.10, and is listed in [http://a257.g.akamaitech.net/7/257/2422/13nov20061500/edocket.access.gpo.gov/cfr_2006/octqtr/49cfr71.10.htm Text] and [http://a257.g.akamaitech.net/7/257/2422/13nov20061500/edocket.access.gpo.gov/cfr_2006/octqtr/pdf/49cfr71.10.pdf pdf] formats.
The boundary between Pacific and Mountain in the United States is set forth at 49 CFR 71.9, and is listed in [http://a257.g.akamaitech.net/7/257/2422/13nov20061500/edocket.access.gpo.gov/cfr_2006/octqtr/49cfr71.9.htm text] and [http://a257.g.akamaitech.net/7/257/2422/13nov20061500/edocket.access.gpo.gov/cfr_2006/octqtr/pdf/49cfr71.9.pdf pdf] formats.]
Canada, Pacific Time includes almost all of the province of British Columbia(except for the Highway 95 corridor and portions around Fort St. John, Dawson Creek and Creston), all of the YukonTerritory and Tungsten, Northwest Territories.
Mexico, the state of Baja Californiais wholly within and the only part of Mexico in the Northwest Zone. Also the westernmost of the Revillagigedo Islands( Colima), Clarion Islanduses the Northwest Zone.
During summer months,
Sonoraand most of Arizona, which is in the Mountain time zone (Pacific zone for Sonora) but does not observe DST, they are on the same time as neighboring states to the west which are on Pacific daylight time.
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.
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 Territorycombined.
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
Ensenada, Baja California, Mexico
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
Fremont, California, USA
Henderson, Nevada, USA
Irvine, California, 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
* [http://www.time.gov/timezone.cgi?Pacific/d/-8/java The official U.S. time for the Pacific Time Zone]
* [http://time5.nrc.ca/webclock_e.shtml Official times across Canada]
* [http://www.travel.com.hk/region/timezone.htm World time zone map]
* [http://geography.about.com/library/misc/ntimezones.htm U.S. time zone map]
* [http://aa.usno.navy.mil/faq/docs/us_tzones History of U.S. time zones and UTC conversion]
* [http://www.worldtimezone.com/time-canada12.html Canada time zone map]
* [http://timeanddate.com/worldclock/full.html Time zones for major world cities]
* [http://www.pst.net PST Pacific Standard Time]
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