West Coast time is the Pacific Time Zone (PT), which is UTC−8 during Standard Time (PST) and UTC−7 during Daylight Saving Time (PDT). It governs the western United States and Canada, including California, Washington, Oregon, and British Columbia.
What Exactly Is Pacific Time?
Pacific Time is one of the four main time zones in the contiguous United States. It is eight hours behind Coordinated Universal Time (UTC−8) in the winter and seven hours behind (UTC−7) in the summer. The switch happens on the second Sunday in March (clocks move forward one hour) and the first Sunday in November (clocks fall back one hour), following U.S. federal law.
The zone includes major cities like Los Angeles, San Francisco, Seattle, Portland, and San Diego, as well as Vancouver and Victoria in Canada. It also covers parts of Nevada (except West Wendover, which uses Mountain Time) and a small slice of Idaho that follows Pacific Time.
How It Relates to Other U.S. Time Zones
Pacific Time is three hours behind Eastern Time (ET). When it is 12:00 noon in New York, it is 9:00 AM in Los Angeles. It is one hour behind Mountain Time (MT), so Denver is an hour ahead of San Francisco. It is two hours behind Central Time (CT), so Chicago runs two hours ahead of the West Coast.
This three-hour gap matters for live events, business calls, and TV broadcasts. A prime-time show airing at 8:00 PM Eastern airs at 5:00 PM Pacific, which is why West Coast viewers often see the same program at a different local time. Sports games, award shows, and news broadcasts are scheduled with this difference in mind.
Why Does the West Coast Have Its Own Time Zone?
Time zones were standardized in the late 19th century for railroad scheduling. Before that, cities used local solar time, which varied by longitude. In 1883, North American railroads adopted four standard time zones: Eastern, Central, Mountain, and Pacific. The Pacific zone was set to align with the 120th meridian west, roughly the longitude of the California–Nevada border.
The U.S. government formally adopted these zones in 1918 with the Standard Time Act. The choice of the 120th meridian placed the West Coast in a zone that is exactly eight hours behind Greenwich Mean Time (GMT). This system remains in place today, with occasional debates about changing it.
Daylight Saving Time on the West Coast
Like most of the U.S. and Canada, the Pacific Time Zone observes daylight saving time. From the second Sunday in March to the first Sunday in November, clocks are set one hour ahead, making it UTC−7. This means that in summer, Los Angeles is three hours behind New York, but in winter it is also three hours behind—because both zones shift together.
There have been proposals to end the time change. California voters approved a ballot measure in 2018 to allow year-round daylight saving time, but it requires federal approval. Oregon and Washington have passed similar laws, but Congress has not acted. Until then, the twice-yearly change continues.
Common Confusions and Mistakes
One frequent mistake is assuming that Pacific Time is always UTC−8. That is only true during standard time. From March to November, it is UTC−7. A meeting scheduled at 2:00 PM PST in July is actually 3:00 PM PDT, so using the wrong abbreviation can cause missed calls.
Another confusion involves Arizona, which does not observe daylight saving time. In summer, Arizona is on Mountain Standard Time (UTC−7), the same as Pacific Daylight Time. So Phoenix and Los Angeles share the same clock time in summer, even though they are in different zones. In winter, Arizona is one hour ahead of California.
Also, not all of Oregon and Washington use Pacific Time. The Oregon town of Ontario, near the Idaho border, uses Mountain Time. The same applies to parts of Idaho that follow Pacific Time, such as the northern panhandle. Always check a specific city, not just the state.
How to Convert to West Coast Time
To convert from UTC, subtract 8 hours during standard time and 7 hours during daylight time. For example, if UTC is 18:00 (6:00 PM) in January, Pacific Standard Time is 10:00 AM. In July, it would be 11:00 AM.
To convert from Eastern Time, subtract 3 hours. From Central, subtract 2 hours. From Mountain, subtract 1 hour. These offsets are constant throughout the year because all zones shift together.
- From UTC: PST = UTC−8, PDT = UTC−7
- From Eastern: always 3 hours behind
- From Central: always 2 hours behind
- From Mountain: always 1 hour behind
Why the Time Zone Matters for Business and Travel
For anyone scheduling calls or travel, the West Coast time zone creates a unique challenge. A 9:00 AM meeting in San Francisco is noon in New York, which is fine for East Coast workers. But a 4:00 PM call in New York is only 1:00 PM in California, so the workday ends later on the West Coast.
International travelers from Asia often find that the time difference works in their favor. A flight from Tokyo to Los Angeles departs in the evening and arrives the same morning, because the date line and time zones combine. Conversely, flying from Los Angeles to Tokyo crosses the date line, so arrival is two days later in local time.
For live events, the three-hour gap means that a 5:00 PM Pacific broadcast is 8:00 PM Eastern. This is why many award shows start at 5:00 PM Pacific, allowing East Coast viewers to watch at 8:00 PM. Sports leagues adjust start times similarly, though West Coast fans often complain about early afternoon games.
Frequently Asked Questions
Is Pacific Time the same as West Coast time?
Yes, in common usage, “West Coast time” refers to Pacific Time. It covers the western states and Canadian provinces that observe UTC−8/UTC−7. Some people also use it loosely to include parts of Nevada and Idaho that are in the Pacific zone.
What is the difference between PST and PDT?
PST is Pacific Standard Time (UTC−8), used from the first Sunday in November to the second Sunday in March. PDT is Pacific Daylight Time (UTC−7), used from the second Sunday in March to the first Sunday in November. The change is part of daylight saving time.
Does California observe daylight saving time?
Yes, California observes daylight saving time like most of the U.S. It shifts to Pacific Daylight Time (PDT) in spring and back to Pacific Standard Time (PST) in fall. A 2018 ballot measure approved year-round DST, but it requires federal law change to take effect.
Why is the West Coast three hours behind the East Coast?
The continental U.S. spans about 2,800 miles, and time zones are roughly 15 degrees of longitude apart. The West Coast is near the 120th meridian, while the East Coast is near the 75th meridian. That 45-degree difference translates to three hours.
What states are in Pacific Time?
California, Washington, and Oregon are fully in Pacific Time. Nevada is mostly in Pacific Time except for West Wendover, which uses Mountain Time. A small part of Idaho (north of the Salmon River) also uses Pacific Time. In Canada, British Columbia and the Yukon use Pacific Time.
Is there a move to make the West Coast use year-round daylight saving time?
Yes, several West Coast states have passed laws or resolutions to adopt year-round DST, but they need federal approval. The U.S. Congress has not passed the necessary legislation, so the status quo remains. Similar efforts exist in other states, but none have succeeded.
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