Compare GMT vs PST
See the live time difference between Greenwich Mean Time and Pacific Standard Time, including DST changes and the best hours to meet.
GMT to PST Difference
Greenwich Mean Time is 8 hours ahead of Pacific Standard Time. Check the live offset, current local times, and hour-by-hour comparison table.
How DST Changes Offset
PST shifts to Pacific Daylight Time during DST, while Greenwich Mean Time may be compared with British Summer Time in summer. The page tracks seasonal offset changes automatically.
Best Hours to Meet
Find overlapping business hours with a visual scheduling grid, then export meeting times as ICS or add them to Google Calendar and Gmail.
PST (Pacific Standard Time, UTC-8) is 8 hours behind GMT (Greenwich Mean Time, UTC+0), so GMT is 8 hours ahead of PST.
Looking for Pitcairn Standard Time? See /time-converter/pst-pitcairn-time-zone.
How to Find the Time Difference Between GMT and PST
Open the GMT vs PST converter: Go to
https://www.xconvert.com/time-converter/gmt-vs-pstto see Greenwich Mean Time and Pacific Standard Time arranged on a visual comparison grid with a 24-hour timeline. This layout is useful when you need to schedule a call between the United Kingdom and the west coast of the United States or Canada, or when a remote team needs to line up work hours across an 8-hour gap.Add comparison cities: Click + Add City and search for places that commonly work with Greenwich Mean Time or Pacific Standard Time, such as London for UK business coordination or a Pacific time city for teams in the United States and Canada. This helps when comparing media, software, customer support, or logistics schedules that span GMT countries such as the United Kingdom, Ghana, or Ireland and Pacific Standard Time regions in North America.
Select a meeting window on the grid: Click Select to enter selection mode, then drag across the colored timeline to highlight a time range in purple; you can resize it with the left and right handles or move the whole block by dragging the center. For example, dragging from 9:00 GMT to 12:00 GMT immediately shows the Pacific Standard Time equivalents of 1:00 PST to 4:00 PST, which is useful for confirming whether a London morning overlaps with an early Pacific work session.
Export and share the result: Once a range is selected, use the export options for ICS download, Google Calendar, Gmail, Copy to clipboard, or Share link. This is practical for sending a confirmed GMT-to-Pacific Standard Time meeting slot to clients, recruiters, distributed engineering teams, or travel coordinators so everyone receives the same time block in a shareable format.
GMT vs PST Offset Explained
Greenwich Mean Time is UTC+0 and Pacific Standard Time is UTC-8. That means Pacific Standard Time is 8 hours behind GMT, and the same relationship can be stated the other way: GMT is 8 hours ahead of Pacific Standard Time. In practical terms, when it is 9:00 GMT, it is 1:00 PST; when it is 12:00 GMT, it is 4:00 PST; when it is 15:00 GMT, it is 7:00 PST; and when it is 18:00 GMT, it is 10:00 PST.
This page is specifically about the standard-time versions of both abbreviations. Greenwich Mean Time uses BST as its daylight saving counterpart, while Pacific Standard Time uses PDT as its daylight saving counterpart. That distinction matters for seasonal scheduling because a winter meeting labeled in Pacific Standard Time may be labeled differently during daylight saving periods, and teams working with the United Kingdom or North American west coast calendars should confirm whether the invitation is using standard time or the daylight counterpart.
GMT is used across a wide geographic spread that includes Burkina Faso, Gambia, Ghana, Guernsey, Guinea, Guinea-Bissau, Iceland, Ireland, Isle of Man, Ivory Coast, Jersey, Liberia, Mali, Mauritania, Saint Helena, Sao Tome and Principe, Senegal, Sierra Leone, Togo, and the United Kingdom. Pacific Standard Time is used in Canada, Mexico, and the United States, making this comparison especially relevant for transatlantic operations, customer support coverage, software release planning, and media distribution between Europe, West Africa, and the Pacific coast of North America.
For business scheduling, the 8-hour separation is large enough that morning hours in Greenwich Mean Time line up with very early hours in Pacific Standard Time. A team planning a handoff from London to the US West Coast can use examples like 15:00 GMT = 7:00 PST to identify a realistic overlap, while 18:00 GMT = 10:00 PST can work for late-afternoon UK communication with a Pacific morning team starting its day.
When GMT and Pacific Standard Time Work Best for Meetings
The most practical overlap usually comes from late morning to early evening in Greenwich Mean Time, which corresponds to early morning to late morning in Pacific Standard Time based on the examples shown above. For instance, 12:00 GMT = 4:00 PST is often too early for a standard office meeting on the Pacific coast, while 15:00 GMT = 7:00 PST and 18:00 GMT = 10:00 PST are more realistic for sales calls, editorial reviews, and engineering standups involving west coast participants.
This time pairing is common in industries with cross-Atlantic workflows. UK-based finance, consulting, SaaS, and media teams often need to coordinate with partners or customers in the United States and Canada, while organizations in Ghana or Ireland may use Greenwich Mean Time scheduling to support North American operations. Because Pacific Standard Time is used in parts of Canada, Mexico, and the United States, a single GMT-to-PST comparison can support regional planning for customer service windows, webinar launches, and travel itineraries involving Pacific gateways.
Countries Using GMT and Pacific Standard Time
Greenwich Mean Time is used in countries and territories including the United Kingdom, Ireland, Iceland, Ghana, Senegal, Sierra Leone, Liberia, Mali, Mauritania, Guinea, Guinea-Bissau, Gambia, Togo, Burkina Faso, Ivory Coast, Sao Tome and Principe, Saint Helena, Guernsey, Jersey, and the Isle of Man. This makes GMT relevant not just for London-based scheduling, but also for coordination across West Africa, Atlantic islands, and British Crown dependencies where organizations may share the same standard-time reference.
Pacific Standard Time is used in Canada, Mexico, and the United States. That makes GMT vs Pacific Standard Time a frequent comparison for international customer support teams, streaming and broadcasting schedules, legal or compliance deadlines, and travel planning involving Pacific coast arrivals and departures. If a company announces a deadline in GMT, west coast teams need to account for the fact that Pacific Standard Time is 8 hours earlier on the clock.
Frequently Asked Questions
What is the time difference between GMT and Pacific Standard Time?
Pacific Standard Time is 8 hours behind GMT, and GMT is 8 hours ahead of Pacific Standard Time. A simple example is that 9:00 GMT = 1:00 PST, which shows how a standard morning hour in Greenwich Mean Time maps to the very early hours of the Pacific day.
Is GMT ahead of Pacific Standard Time or behind it?
GMT is ahead of Pacific Standard Time by 8 hours. That means if a team in a GMT region schedules something for the afternoon, the Pacific Standard Time side will usually see it in the morning, such as 15:00 GMT = 7:00 PST.
How do I convert GMT to Pacific Standard Time quickly?
Use the visual grid to compare the two timelines side by side and drag across the GMT row to see the matching Pacific Standard Time range instantly. The examples on this page show the pattern clearly: 12:00 GMT = 4:00 PST and 18:00 GMT = 10:00 PST, which helps when planning calls, deadlines, or online events.
Does this page cover daylight saving time too?
This comparison is specifically for the standard-time abbreviations: Greenwich Mean Time and Pacific Standard Time. Their daylight saving counterparts are BST for GMT regions that switch seasonally and PDT for Pacific Standard Time regions that observe daylight saving, so meeting labels can change depending on the season even when the participants stay in the same place.
Which countries use GMT and which countries use Pacific Standard Time?
GMT is used in Burkina Faso, Gambia, Ghana, Guernsey, Guinea, Guinea-Bissau, Iceland, Ireland, Isle of Man, Ivory Coast, Jersey, Liberia, Mali, Mauritania, Saint Helena, Sao Tome and Principe, Senegal, Sierra Leone, Togo, and the United Kingdom. Pacific Standard Time is used in Canada, Mexico, and the United States, which is why this conversion is common for North America–Europe and North America–West Africa coordination.
What are some example GMT to Pacific Standard Time conversions?
Several common examples are already established: 9:00 GMT = 1:00 PST, 12:00 GMT = 4:00 PST, 15:00 GMT = 7:00 PST, and 18:00 GMT = 10:00 PST. These examples are useful for evaluating whether a GMT morning, noon, or late-afternoon slot is practical for a Pacific Standard Time participant.
Is PST Pacific Standard Time or Pitcairn Standard Time?
On this page, PST means Pacific Standard Time (UTC-8). PST can also mean Pitcairn Standard Time (UTC-8), and if you need that version, use /time-converter/pst-pitcairn-time-zone instead of this GMT vs Pacific Standard Time comparison.