🌉 GMT to PST Converter

What is the GMT to PST Converter?

GMT and PST are not simply two points a fixed number of hours apart, because only one of the two zones moves its clocks. Greenwich Mean Time is the reference zone at UTC+00:00 and, in this converter, it is treated as fixed all year, exactly like UTC. US Pacific Time (covering cities like Los Angeles, San Francisco, Seattle and Vancouver) switches between Pacific Standard Time (UTC-08:00) in winter and Pacific Daylight Time (UTC-07:00) in summer, shifting clocks forward in March and back in November. The practical effect is that a GMT to PST converter has to answer two different questions depending on the date: is the US side currently on PST or PDT, and only then, what is the actual hour gap. The gap is 8 hours for about four months of the year and 7 hours for about eight months, and getting the wrong one produces an answer that is off by a full hour.

Getting the date right matters more than most people assume. The United States begins Daylight Saving Time on the second Sunday of March and ends it on the first Sunday of November, per the rules set out in the Energy Policy Act of 2005. A meeting scheduled for the last week of a month can straddle that boundary without anyone noticing, since the GMT side has no daylight-saving cue of its own to prompt a re-check. This gmt to pst converter avoids that mistake by computing the actual UTC offset for America/Los_Angeles on the specific date entered, rather than applying a single remembered number like "7 hours" or "8 hours" year-round.

Under the hood the tool uses the Intl.DateTimeFormat API that ships with every modern browser, which draws on the IANA Time Zone Database, the same reference dataset operating systems, phones and server software use to track historical and current time zone rules worldwide. The wall-clock numbers you type for GMT are treated as a UTC instant directly, since GMT and UTC share the same offset, then that instant is rendered as America/Los_Angeles local time. No fixed -7 or -8 constant is hardcoded anywhere in the logic, so the result stays correct through every DST changeover without needing an annual update. It is worth noting this is different from UK civil time, which itself shifts to British Summer Time (BST, UTC+01:00) in summer. This converter treats the GMT input as the true fixed Greenwich Mean Time reference, not the seasonally shifting UK clock.

A gmt to pst converter comes up constantly for anyone bridging work across Europe, Africa or a GMT-referenced broadcast schedule and the US West Coast: a support team handing off a shift, a developer joining a standup, a viewer checking when a livestream airs, or a family coordinating a call. Because the calculation runs entirely in your browser, nothing about the date, time or purpose of your conversion is sent anywhere.

When to use it

• Scheduling a call or meeting between a GMT-based office in Europe or Africa and a US West Coast team without misjudging the current PST/PDT gap.
• Converting a webinar, live class, or product launch time listed in GMT into the correct US Pacific time for California, Oregon, Washington or Vancouver attendees.
• Working out shift handoff times for support, engineering, or operations teams split between a GMT time zone and the US Pacific coast.
• Checking whether a flight departure or arrival time, quoted in GMT, lands at a reasonable hour on the West Coast.

How to use the GMT to PST Converter

1. Enter the date and time exactly as GMT (the same as UTC, no offset to figure out).
2. Or click "Use current GMT time" to fill in the present moment automatically.
3. Read the equivalent US Pacific time shown below, including whether the West Coast is on PST or PDT and the exact hour gap for that date.
4. Use the Copy button to grab the converted Pacific time result for a message, calendar invite, or note.

Formula & method

Worked examples

PST/PDT gap from GMT by season

Quick reference: common GMT hours converted to PST (winter, UTC-8)

Common mistakes to avoid

• Applying a single fixed offset all year. Treating the gap as always 8 hours (or always 7) breaks for roughly eight months of the year because Pacific Time itself changes with US daylight saving while GMT does not move at all. Always check which side of the DST boundary your date falls on.
• Confusing GMT with UK civil time. GMT is a fixed reference at UTC+00:00, but the United Kingdom itself shifts to British Summer Time (BST, UTC+01:00) for part of the year. If a schedule actually means "UK local time" rather than true GMT, converting it as if it never changes will be an hour off in summer.
• Forgetting the date can roll backward. Because Pacific Time is behind GMT, a morning time in London or a GMT broadcast schedule often lands on the previous calendar day in California. Always confirm the resulting date, not just the clock time, especially for anything before roughly 8 AM GMT.
• Using a generic 8-hour offset from memory. US Pacific Time is often loosely remembered as "8 hours behind GMT," which is only correct for about four months of the year. For the other eight months, when the US observes Pacific Daylight Time, the real gap is 7 hours.

Glossary

GMT

Greenwich Mean Time, the reference zone at UTC+00:00, treated as fixed all year in this converter.

PST

Pacific Standard Time, the US West Coast zone offset of UTC-08:00 used outside the daylight saving window.

PDT

Pacific Daylight Time, the US West Coast zone offset of UTC-07:00 used during the daylight saving window, roughly mid-March to early November.

UTC

Coordinated Universal Time, the neutral global reference every time zone offset is measured against, numerically identical to GMT.

IANA time zone database

The standardized, regularly updated dataset of time zone rules and historical offsets that browsers and operating systems use to resolve zones like America/Los_Angeles correctly.

Daylight Saving Time (DST)

The seasonal practice of moving clocks forward by an hour in spring and back in autumn, observed by the continental US but not by GMT.

Frequently asked questions