The Pacific Time abbreviation that works on any date is PT. If you want to name the season too, write PST for Pacific Standard Time during the winter months, or PDT for Pacific Daylight Time once clocks jump ahead each spring and through the summer.
That choice matters more than it seems. A meeting invite that says "10 a.m. PST" in June is, strictly read, an hour off, because the West Coast is on daylight time then. Most readers will guess what you meant, but PT avoids the question entirely.
Quick facts
General form
PT, Pacific TimeWinter form
PST, Pacific Standard Time (UTC minus 8 hours)Summer form
PDT, Pacific Daylight Time (UTC minus 7 hours)Type
Initialisms, said letter by letterPeriods
None: PT, not P.T.Used in
Meeting invites, TV listings, flight times, event pagesCompared with Eastern
Three hours earlier than Eastern Time
Choosing the right Pacific Time abbreviation
| Abbreviation | Full form | When it is correct |
|---|---|---|
| PT | Pacific Time | Any day of the year |
| PST | Pacific Standard Time | After clocks fall back in autumn, until they spring ahead |
| PDT | Pacific Daylight Time | The roughly eight months of daylight saving |
A simple rule: if you are writing something that stays up for months, such as office hours on a website, use PT. If you are naming one exact moment, PST or PDT is fine as long as it matches the season.
What PST stands for
PST is Pacific Standard Time, the zone's base setting. It runs eight hours behind Coordinated Universal Time, written UTC minus 8. Clocks sit on PST for roughly the colder third of the year, after they fall back an hour in autumn.
Because PST is the form most people learned first, it often gets used all year. Style guides and careful schedulers try to avoid that habit, but in casual speech "PST" usually just means "West Coast time."
What PDT stands for
PDT is Pacific Daylight Time, used after clocks spring forward one hour in March. It is UTC minus 7. Since daylight time covers about eight months of the year, PDT is actually the label in effect most of the time, even though people write it less often.
A work email in July: "The webinar starts at 1:00 p.m. PDT, which is 4:00 p.m. ET." The sender names the summer form and also gives the East Coast time, so nobody has to do the math.
Where clocks run on Pacific Time
- California, all of it
- Washington, all of it
- Oregon, except a small eastern area on Mountain Time
- Nevada, nearly all of it
- Idaho, the northern panhandle
- British Columbia in Canada, most of the province
- Baja California in Mexico
Big cities on this clock include Los Angeles, San Francisco, San Diego, Seattle, Portland and Las Vegas. Going east, the next zone is Mountain Time, one hour later.
Pacific Time next to the other US zones
Picture a clock in Los Angeles reading 9:00 a.m. At that moment, Denver shows 10:00 a.m. on Mountain Time, Chicago shows 11:00 a.m. on Central Time and New York shows noon. That three-hour gap with the East Coast is why national TV shows are often listed as "8/7c" for the East and Central zones, with West Coast viewers seeing a separate local schedule. For a worldwide reference point, see GMT, which sits eight hours ahead of PST.
Formatting tips for writing times
- Let the letters follow the clock reading, as in "6:45 p.m. PT," never in front of it.
- Keep all capitals and skip the dots.
- Pair it with a.m. or p.m. so the hour is clear.
- For a national audience, give two zones: "noon ET / 9 a.m. PT."
- Do not add "time" after it. "PT time" repeats itself.
For more everyday short forms, visit common abbreviations.
Questions people ask
Is it PST or PDT right now?
Ask whether daylight saving is on. In spring, summer and early fall the West Coast uses PDT, and in the darker winter stretch it uses PST. PT sidesteps the question.
What is the abbreviation for Pacific Time?
The abbreviation for Pacific Time is PT. PST and PDT are the seasonal versions.
Is PST the same as PT?
Not exactly. PT is the zone in general, while PST names only the standard time half of the year. Everyday speakers blur the two all the time.
How many hours behind Eastern is Pacific Time?
Pacific Time is three hours behind Eastern Time all year, because both zones switch to daylight time on the same dates.
Does all of Nevada use Pacific Time?
Almost all of it does, including Las Vegas and Reno. A small border town near Idaho keeps Mountain Time.