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The Pacific Time Zone observes standard time by subtracting eight hours from Coordinated Universal Time (UTC−8). The standard time in this zone is based on the mean solar time of the 120th meridian west of the Greenwich Observatory. During daylight saving time, its time offset is UTC−7 and is thus based on the mean solar time of the 105th meridian west of the Greenwich Observatory. In the United States and Canada, this time zone is generically called the Pacific Time Zone (PT). Specifically, it uses Pacific Standard Time (PST) when observing standard time (late autumn to early spring), and Pacific Daylight Time (PDT) when observing daylight saving time (early spring to late autumn). Most of Canada uses daylight saving time. In Mexico the UTC−8 time zone is known as the ''Northwest Zone'', which is synchronized with the U.S. PDT daylight saving schedule. The largest city in the Pacific Time Zone is Los Angeles, California; the city's metropolitan area is the largest in the zone. The zone is one hour ahead of the Alaska Time Zone, one hour behind the Mountain Time Zone, two hours behind the Central Time Zone, and three hours behind the Eastern Time Zone. ==United States== (詳細はstates and/or areas are part of the Pacific Time Zone: *California *Washington *Oregon – all, except for most of Malheur County, on the Idaho border (the dividing line goes through the southwest corner of township 35S, range 37E, and lies at a latitude of approximately 42.4507448N). *Nevada *Idaho Panhandle – the northern half of Idaho, north of the Salmon River. The town of Hyder, Alaska, is officially in the Alaska Time Zone. However, most of the town observes the Pacific Time because of strong connections with nearby Stewart, British Columbia, which is in the Pacific Time Zone. The United States Post Office in Hyder strictly adheres to Alaska Time. ==Canada== (詳細はCanada, the Pacific Time Zone includes most of British Columbia (except for the Highway 95 corridor and portions around Tumbler Ridge, Fort St. John, Dawson Creek, Golden and Creston), all of Yukon and Tungsten, Northwest Territories. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Pacific Time Zone」の詳細全文を読む スポンサード リンク
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