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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).
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.
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