Time Zones in United States.
The Pacific Time Zone refers to a time zone which observes standard time by subtracting eight hours from Greenwich Mean Time (UTC/GMT -8). 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 GMT -7.
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).
Effective since 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, in the U.S.A. as well as in Canada.
|Anaheim, California||Portland, Oregon||San Jose, California|
|Burnaby, British Columbia||Richmond, British Columbia||Seattle, Washington|
|Fresno, California||Riverside, California||Stockton, California|
|Las Vegas, Nevada||Sacramento, California||Surrey, British Columbia|
|Long Beach, California||San Bernardino, California||Tijuana, Baja California|
|Los Angeles, California||San Diego, California||Vancouver, British Columbia|
|Oakland, California||San Francisco, California|
Greenwich Mean Time (GMT) is originally referring to mean solar time at the Royal Observatory in Greenwich, London. GMT and Coordinated Universal Time (UTC) can be seen equivalent when fractions of a second are not important.