GMT - 8:00 Pacific Standard Time

The Pacific Time Zone observes standard time by subtracting eight hours from Coordinated Universal Time (UTC-8). The clock time in this zone is based on the mean solar time of the 120th degree meridian west of the Greenwich Observatory. During daylight saving time, its time offset is UTC-7. Coordinated Universal Time is also called Greenwich Mean Time (GMT).

In the United States and 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).

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The zone is one hour behind the Mountain Time Zone, two hours behind the Central Time Zone and three hours behind the Eastern Time Zone.