Pacific Standard Time (PST) also known as The Pacific Time Zone (PT in The United States and Canada) is observed in the Western states of the USA. In Canada PST is used in in the entire Yukon Territory, while British Columbia and Northwest Territories are split between the Pacific Time Zone and the Mountain Time Zone. During daylight saving time PDT (Pacific Daylight Time) is observed instead, with the time zone offset of UTC/GMT -7.US states using PST:
California and Washington.
Three US states use both PST and MST: Idaho, Nevada and Oregon.
Alaska is split between the PST and the Alaska Time Zone