Convert UTC to PST Coordinated Universal Time ↔ Pacific Standard Time Free Online Secure
Type a time in UTC and read it in PST straight away. The offset is −8 h, the arithmetic wraps at midnight, and the answer says which day it lands on.
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Through the day — Convert UTC to PST (Coordinated Universal Time ↔ Pacific Standard Time)
| UTC | PST |
|---|---|
| 00:00 | 16:00 |
| 03:00 | 19:00 |
| 06:00 | 22:00 |
| 09:00 | 01:00 |
| 12:00 | 04:00 |
| 15:00 | 07:00 |
| 18:00 | 10:00 |
| 21:00 | 13:00 |
Where these units come from
Until the middle of the nineteenth century every town kept its own noon, set by the sun overhead, and nobody minded that the next town was four minutes behind. Railways ended that: a timetable cannot be written for a hundred local noons. Britain put its railways on Greenwich time in 1847, and in 1884 the International Meridian Conference in Washington chose Greenwich as the prime meridian and sketched the twenty-four-hour scheme we still use. Greenwich Mean Time was the world's reference until 1972, when Coordinated Universal Time replaced it: UTC is kept by atomic clocks and tied back to the turning Earth by leap seconds. The abbreviations on this page name standard time — the winter setting — which is why each one is a fixed number of hours rather than something that drifts through the year.
Where you meet them
A time zone becomes real the moment two people in different places have to agree on one moment: a call between offices, a flight that lands before it took off, a market that opens while you are asleep, a deadline written in somebody else's afternoon. Server logs, train and flight schedules and anything stamped with a time are kept in UTC precisely so that the question can always be settled, no matter whose clock was on the wall.
Questions people ask
What about summer time?
The offsets here are standard-time offsets, the ones a zone keeps in winter. Where summer time is observed, the same places move one hour further on for part of the year and take a different name: Central European Time becomes Central European Summer Time, Eastern Standard Time becomes Eastern Daylight Time. The switching dates are not the same in every country, and the two hemispheres change in opposite months, so for a date inside a summer-time period add an hour to whichever side observes it.
Why isn't every difference a whole number of hours?
Because offsets are decided by governments, not by geometry. India is half an hour off the hour, at UTC+05:30; Nepal is three quarters, at UTC+05:45; the Chatham Islands are at UTC+12:45. Any of these can be changed by law, and several countries have moved their offset within living memory.
Is the answer exact?
Where both units are defined in terms of one another by whole numbers, yes — the page says so above the figure, and the only rounding is in how many digits are shown. Where the ratio has no finite decimal, the page shows twelve significant digits and says the relation is approximate rather than pretending otherwise.
Does anything I type leave my device?
No. The arithmetic runs in your browser; nothing is uploaded and there is no server to upload it to. Load the page once and it keeps working with the network switched off.
Translating the machine clock into California time
Logs, alerts, flight plans and research schedules are written in UTC. The people who act on them in Los Angeles, San Francisco, Portland or Seattle read the Pacific wall clock. To turn one into the other you must convert UTC to PST, and the sum is subtraction: take away eight hours. 18:00 UTC is 10:00 PST, 08:00 UTC is midnight, and 03:00 UTC is 19:00 PST on the previous evening. Every UTC reading from 00:00 to 07:59 belongs to the previous calendar date on the Pacific coast.
The page below gives the rule, two lookup tables, a description of both zones, an explanation of the summer shift and a series of technical situations: tsunami bulletins, wildfire satellites, graphics-card rentals, certificate renewals and game-server maintenance. The arithmetic is performed in your browser, and nothing you type leaves it.
The arithmetic of a “convert UTC to PST” calculation
Take eight hours away
Pacific Standard Time is UTC−8. Subtract eight from the UTC hour each time you convert UTC to PST. When the result is negative, add 24 and go back one date. For example, 05:30 UTC gives −2:30, which is 21:30 PST the previous day.
Eight readings
00:30 UTC is 16:30 PST the day before. 06:15 UTC is 22:15 PST the day before. 09:00 UTC is 01:00 PST. 12:00 UTC is 04:00 PST. 15:45 UTC is 07:45 PST. 18:00 UTC is 10:00 PST. 21:30 UTC is 13:30 PST. 23:45 UTC is 15:45 PST. The first two fall on the earlier date.
Written with an offset
The ISO notation 2026-01-20T18:00:00Z names the same instant as 2026-01-20T10:00:00-08:00. A program that reads the second form needs no table of American daylight-saving dates, since the offset travels with the timestamp.
UTC: the clock behind the clocks
No summer time, no surprises
UTC has no daylight saving. It is held steady by atomic clocks and adjusted by leap seconds now and then. Every other zone is defined as an offset from it, which makes it the natural language of anything that must be shared across borders and the starting point whenever you convert UTC to PST.
Why systems store it
A wall-clock hour repeats once a year and vanishes once a year. On 1 November 2026 the hour from 01:00 to 02:00 happens twice in California, and on 8 March the hour from 02:00 to 03:00 does not happen at all. UTC never has those problems.
Pacific Standard Time
The coast and its cities
PST covers California, Oregon, Washington and most of Nevada in the United States, British Columbia in Canada and Baja California in Mexico. Its principal cities are Los Angeles, San Francisco, San Diego, Sacramento, Portland, Seattle, Las Vegas and Vancouver. From the second Sunday in March to the first Sunday in November, the region uses Pacific Daylight Time, PDT, at UTC−7.
A hub of the digital world
Much of the world’s software, entertainment and online commerce is created and administered here. Status pages, release notes and press announcements are therefore stamped with Pacific time, which readers elsewhere have to convert UTC to PST to align with their own logs.
Other PSTs
PST can also mean Philippine Standard Time (UTC+8) or Pakistan Standard Time (UTC+5). Here it means the North American Pacific zone.
Eight hours and the working day
Who is awake when
A Californian team working 09:00 to 17:00 PST is at work from 17:00 to 01:00 UTC. A European team working 08:00 to 16:00 UTC touches them only between 16:00 and 17:00 UTC, which is 08:00 to 09:00 PST. In practice cross-ocean calls fall at the start of the Pacific day and the end of the European one.
Maintenance windows
A window from 08:00 to 10:00 UTC falls from midnight to 02:00 PST, when few Californian users are active. The same window moved to 12:00 to 14:00 UTC falls from 04:00 to 06:00 PST. Choose the UTC hours with the local sleepers in mind.
Daily totals
A report that closes at 00:00 UTC covers, for California, the period from 16:00 PST the previous day to 16:00 PST today. Orders placed after 16:00 PST show up in tomorrow’s UTC report.
California’s clock change and the fixed UTC
The mechanism
UTC never moves, while California does. In 2026 the Pacific zone moves forward on 8 March and back on 1 November. Between those dates it is on PDT, UTC−7, and 18:00 UTC is 11:00 PDT instead of 10:00 PST.
Graphs that seem to shift
A traffic chart drawn in UTC looks stable all year, but a chart drawn in local time seems to jump by an hour twice a year, since people keep their habits on the wall clock. For behaviour analysis, use the users’ local time rather than UTC.
What the calculator does
The form above subtracts eight hours, the winter figure. For a date between 8 March and 1 November, subtract seven and read the result as PDT. The relationship with UTC is exact; only the wall clock moves.
Tsunami bulletins
Messages stamped in UTC
Warning centres publish tsunami messages in UTC. An earthquake at 14:32 UTC happened at 06:32 PST, and a message that says “first wave expected at 17:10 UTC” points to 09:10 PST. Residents of the coast who read the wall clock must convert UTC to PST at once.
Following updates
Bulletins are updated every 30 to 60 minutes. If the first appears at 14:50 UTC and the second at 15:30 UTC, in California they appear at 06:50 and 07:30. The comparison is straightforward only if all times are on the same clock.
Wildfire detection from space
Satellite passes
Satellites that detect fires cross California several times a day, and the maps carry UTC stamps. A detection at 21:45 UTC was made at 13:45 PST. Fire crews treat the map as a photograph of the afternoon.
Status reports
Authorities issue “as of 18:00 PST” updates, which are 02:00 UTC the next day. A European analyst should know that 02:00 UTC on 14 July is 19:00 PDT on 13 July, not 18:00.
Renting graphics processors by the hour
Reservations in UTC
Cloud providers that rent accelerators for training machine-learning models usually define reservations in UTC. A block that starts at 02:00 UTC starts at 18:00 PST on the previous evening. A researcher in California who wants the machines at 09:00 PST must book 17:00 UTC.
Billing days
Invoices count usage by UTC day, so a job that runs from 16:00 PST to 20:00 PST straddles two billing days. Anyone reviewing the bill needs to convert UTC to PST to link a line to a local working session.
Certificates and renewal windows
Expiry in UTC
A certificate that expires at 08:00 UTC expires at midnight PST. Automated renewal tools often start a few days earlier and run at a random time, but an administrator reading an alert at 08:05 UTC has already missed the cut-off by five minutes, though the wall clock in California shows 00:05.
Planning a renewal
Plan renewals for the Pacific working day: 17:00 to 01:00 UTC. A change made then falls between 09:00 and 17:00 PST, when the team is at the desk.
Game servers and weekly maintenance
The Tuesday window
Many online games schedule weekly maintenance on Tuesday mornings Pacific time. A window from 02:00 to 06:00 PST runs from 10:00 to 14:00 UTC. Players in Europe find the servers off at lunchtime, while those in Asia are in the evening.
Announcements
A notice that says “servers go down at 2 a.m. PST” corresponds to 10:00 UTC. A player who wants to use the “convert UTC to PST” calculation for the announcement avoids losing a morning raid.
Observing the sky from California
Passes of the space station
Predictions for the International Space Station give times in UTC. A pass at 02:10 UTC is visible in Los Angeles at 18:10 PST, just after sunset in winter. A pass at 13:30 UTC would fall at 05:30 PST, in the dark before dawn.
Eclipses and occultations
An event listed for 07:15 UTC can be seen from California at 23:15 PST on the previous evening. Observers must adapt their calendar, since the date also changes.
Ports and ship movements
Los Angeles and Long Beach
Port schedules use local time. A vessel due at 06:00 PST arrives at 14:00 UTC. Shipping agents in Asia and Europe read AIS data and port notices in UTC, so each event must be converted before it is compared.
Filing deadlines
A declaration lodged at 17:30 PST is lodged at 01:30 UTC on the next day. If a rule says “end of day on 31 January Pacific time”, the deadline in UTC is 08:00 on 1 February.
Every hour in one table
UTC to PST
00:00 UTC becomes 16:00 PST (previous day). 01:00 UTC becomes 17:00 PST (previous day). 02:00 UTC becomes 18:00 PST (previous day). 03:00 UTC becomes 19:00 PST (previous day). 04:00 UTC becomes 20:00 PST (previous day). 05:00 UTC becomes 21:00 PST (previous day). 06:00 UTC becomes 22:00 PST (previous day). 07:00 UTC becomes 23:00 PST (previous day). 08:00 UTC becomes 00:00 PST. 09:00 UTC becomes 01:00 PST. 10:00 UTC becomes 02:00 PST. 11:00 UTC becomes 03:00 PST. 12:00 UTC becomes 04:00 PST. 13:00 UTC becomes 05:00 PST. 14:00 UTC becomes 06:00 PST. 15:00 UTC becomes 07:00 PST. 16:00 UTC becomes 08:00 PST. 17:00 UTC becomes 09:00 PST. 18:00 UTC becomes 10:00 PST. 19:00 UTC becomes 11:00 PST. 20:00 UTC becomes 12:00 PST. 21:00 UTC becomes 13:00 PST. 22:00 UTC becomes 14:00 PST. 23:00 UTC becomes 15:00 PST.
How to read it
Each entry pairs a UTC hour with the matching Pacific hour and says when the date moves. The rows follow the eight-hour subtraction that the calculator uses when you convert UTC to PST.
Half-hour marks
UTC to PST at :30
00:30 UTC becomes 16:30 PST (previous day). 01:30 UTC becomes 17:30 PST (previous day). 02:30 UTC becomes 18:30 PST (previous day). 03:30 UTC becomes 19:30 PST (previous day). 04:30 UTC becomes 20:30 PST (previous day). 05:30 UTC becomes 21:30 PST (previous day). 06:30 UTC becomes 22:30 PST (previous day). 07:30 UTC becomes 23:30 PST (previous day). 08:30 UTC becomes 00:30 PST. 09:30 UTC becomes 01:30 PST. 10:30 UTC becomes 02:30 PST. 11:30 UTC becomes 03:30 PST. 12:30 UTC becomes 04:30 PST. 13:30 UTC becomes 05:30 PST. 14:30 UTC becomes 06:30 PST. 15:30 UTC becomes 07:30 PST. 16:30 UTC becomes 08:30 PST. 17:30 UTC becomes 09:30 PST. 18:30 UTC becomes 10:30 PST. 19:30 UTC becomes 11:30 PST. 20:30 UTC becomes 12:30 PST. 21:30 UTC becomes 13:30 PST. 22:30 UTC becomes 14:30 PST. 23:30 UTC becomes 15:30 PST.
Why it helps
Many bulletins and scheduled jobs sit at half past the hour, for example 14:30 UTC. The table gives the Pacific time at a glance.
Ten readings with minutes
Examples
01:05 UTC becomes 17:05 PST (previous day). 03:20 UTC becomes 19:20 PST (previous day). 05:50 UTC becomes 21:50 PST (previous day). 07:35 UTC becomes 23:35 PST (previous day). 10:10 UTC becomes 02:10 PST. 13:25 UTC becomes 05:25 PST. 16:40 UTC becomes 08:40 PST. 19:55 UTC becomes 11:55 PST. 22:15 UTC becomes 14:15 PST. 23:05 UTC becomes 15:05 PST.
The minutes stay unchanged
An eight-hour difference leaves the minutes as they are. A different minute figure in your answer points to a misread input.
What part of the day is it in California?
Pacific hours for each UTC hour
06:00 UTC becomes 22:00 PST (night). 08:00 UTC becomes 00:00 PST (night). 10:00 UTC becomes 02:00 PST (night). 12:00 UTC becomes 04:00 PST (night). 14:00 UTC becomes 06:00 PST (early morning). 16:00 UTC becomes 08:00 PST (morning). 18:00 UTC becomes 10:00 PST (morning). 20:00 UTC becomes 12:00 PST (around midday). 22:00 UTC becomes 14:00 PST (afternoon).
Using the list
The words in brackets describe the part of the day in California. Use them to avoid planning a call or a maintenance task at a bad hour.
Other American zones from UTC
The ladder
Subtract five hours for Eastern, six for Central, seven for Mountain and eight for Pacific. Alaska is nine and Hawaii ten. In summer each zone that observes daylight saving is one hour closer to UTC.
One moment on five clocks
At 18:00 UTC, New York shows 13:00, Chicago 12:00, Denver 11:00 and Los Angeles 10:00. An invitation that lists them all spares readers a separate convert UTC to PST.
Dated examples
January
On Tuesday 20 January, 18:00 UTC is 10:00 PST. No daylight saving is in force, so subtract eight hours.
Mid-March
On Tuesday 17 March, 18:00 UTC is 11:00 PDT. California moved on 8 March, so subtract seven hours.
July
On Tuesday 21 July, 18:00 UTC is 11:00 PDT. Seven hours apply all summer.
Early November
On Tuesday 3 November, 18:00 UTC is 10:00 PST. California returned to standard time on 1 November.
Checklist: how to convert UTC to PST
Before
Read the label
PST or PDT? If the source says PT and the date is between 8 March and 1 November, treat it as PDT, UTC−7.
Use 24 hours
4:15 p.m. is 16:15, and 12:00 a.m. is 00:00.
After
Subtract eight
If the UTC hour is below 08:00, add 24 first.
Check the date
UTC readings between 00:00 and 07:59 belong to the previous date in California.
The Rose Parade and New Year’s Day
A morning on the first of January
The Rose Parade in Pasadena starts at 8:00 a.m. PST on 1 January, which is 16:00 UTC. The television coverage begins an hour or so earlier, at 7:00 a.m. PST, or 15:00 UTC. Viewers in Britain watch in mid-afternoon, and those in Central Europe in the early evening, an hour later still.
Planning the broadcast
Producers who send the programme to overseas partners include the UTC time in the schedule. A feed that leaves the studio at 14:45 UTC reaches European screens just in time for the opening float. A short convert UTC to PST on the cue times prevents expensive mistakes.
Remote interviews and onboarding
Choosing a slot between California and Europe
A company in the Bay Area that hires a developer in Europe has a narrow window. An interview at 08:00 PST is at 16:00 UTC and 17:00 CET, the end of the working day in Central Europe. An interview at 07:00 PST is at 15:00 UTC, which suits both sides slightly better.
First-day schedules
An onboarding session at 9:00 a.m. Pacific is at 17:00 UTC. For a new employee in Romania it is 19:00. HR departments that publish the schedule in UTC avoid the confusion of three different local hours.
Mistakes when you convert UTC to PST
Adding
California is behind UTC. If your answer is later than the UTC time, you added.
Using five hours
Five hours belongs to the Eastern zone. The Pacific coast needs eight.
Losing the previous date
03:00 UTC is 19:00 PST on the previous day. Keeping the date creates a 24-hour error.
PST in July
In summer the gap is seven hours. A notice that says PST in July should be read as PDT.
Frequently asked questions
How far apart are UTC and PST?
Eight hours, with PST behind.
How do I convert UTC to PST?
Subtract eight hours, adding 24 and stepping back a date if the result is negative.
What is 18:00 UTC in PST?
10:00 PST.
Why do I sometimes subtract seven hours?
Because California uses PDT, UTC−7, from the second Sunday in March to the first Sunday in November.
Is my input uploaded?
No. It stays in your browser.
More time zone converters
Related pages: Convert UTC to EST, Convert UTC to GMT, Convert CET to PST, Convert EET to PST, Convert PST to CET, Convert IST to UTC, Convert GMT to CST, Convert CET to GMT, Convert IST to WET. For the reverse direction, open Convert PST to UTC.
In brief, to convert UTC to PST you subtract eight hours, mind the previous date and switch to seven hours during daylight saving time. The calculation runs on your own device, with no sign-up and no upload.