PST vs GMT Time Difference

How to Find the Time Difference Between PST and GMT

PST (Pacific Standard Time, UTC-8) is compared here with GMT (Greenwich Mean Time, UTC+0). GMT is 8 hours ahead of PST, which means when it is 9:00 in Pacific Standard Time, it is 17:00 in Greenwich Mean Time.

Looking for Pitcairn Standard Time? See /time-converter/pst-pitcairn-time-zone.

1. Open the PST vs GMT page: Visit https://www.xconvert.com/time-converter/pst-vs-gmt to see Pacific Standard Time pre-loaded against Greenwich Mean Time on the visual comparison grid. This is useful when you are planning a call between the US or Canadian West Coast and the United Kingdom, or coordinating support coverage between North American operations and teams working on GMT.

2. Add comparison cities if your schedule involves more regions: Click + Add City and search for cities that commonly connect with Pacific Standard Time and Greenwich Mean Time workflows, such as London for UK business hours, Los Angeles for West Coast operations, or Vancouver for cross-border coordination in media, software, and logistics. Adding extra rows helps remote teams compare whether a GMT-based afternoon overlaps with a Pacific Standard Time morning before sending invites.

3. Drag to select a workable meeting window: Use the grid in Select mode, then drag across the Pacific Standard Time row to highlight a range in purple, such as 9:00 to 12:00 PST, and compare it directly with the Greenwich Mean Time row showing 17:00 to 20:00 GMT. You can resize the range with the left or right handles, or drag the center to test alternatives, which is especially useful if a California sales team wants late-morning coverage that still lands inside an early-evening UK slot.

4. Export the selected time for scheduling: After selecting a range, use the export options for ICS download, Google Calendar, Gmail, Copy to clipboard, or Share link. This is practical for sending a confirmed cross-time-zone slot to a distributed team, adding a PST-to-GMT handoff to a calendar, or sharing a link with clients so everyone sees the same meeting window in their own local time.

PST vs GMT Offset Explained

Pacific Standard Time is UTC-8, while Greenwich Mean Time is UTC+0. The fixed comparison on this page is that GMT is 8 hours ahead of PST, or equivalently, PST is 8 hours behind GMT, so a Pacific Standard Time workday starts much earlier relative to Greenwich Mean Time business hours.

This difference matters for real scheduling decisions. For example, 9:00 PST equals 17:00 GMT, 12:00 PST equals 20:00 GMT, 15:00 PST equals 23:00 GMT, and 18:00 PST equals 2:00 GMT the next day, which means late-afternoon meetings in Pacific Standard Time often fall outside normal office hours in Greenwich Mean Time regions.

Both abbreviations are standard-time labels rather than year-round local clock names. Pacific Standard Time changes seasonally to PDT, and Greenwich Mean Time changes seasonally to BST, so the exact business overlap between West Coast North America and GMT-based locations can shift during the year even though this page specifically compares Pacific Standard Time with Greenwich Mean Time.

Pacific Standard Time is used in Canada, Mexico, and the United States, while Greenwich Mean Time is used across 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. That makes this comparison relevant for software teams, customer support operations, shipping coordination, media distribution, and financial communication spanning North America, West Africa, and the British Isles.

When PST and GMT Work Best for Meetings

Pacific Standard Time and Greenwich Mean Time have the clearest overlap when Pacific Standard Time is in the morning and Greenwich Mean Time is in the late afternoon or evening. A 9:00 PST meeting lands at 17:00 GMT, which works well for same-day calls with UK or West African contacts before their business day ends.

As the Pacific Standard Time day moves later, Greenwich Mean Time quickly reaches late evening and then the next calendar day. A 15:00 PST meeting becomes 23:00 GMT, and 18:00 PST becomes 2:00 GMT the next day, so product demos, legal reviews, and account-management calls are usually easier to place earlier in the Pacific Standard Time day if GMT participants need normal working hours.

This pattern is especially important for industries with fixed handoff windows. West Coast engineering teams may use early-morning Pacific Standard Time standups to connect with London-based stakeholders, while ecommerce, logistics, and customer-service teams often use Pacific Standard Time mornings for live coordination before Greenwich Mean Time offices close.

Where PST and GMT Are Commonly Used

Pacific Standard Time is closely associated with the western part of North America, including major business activity in the United States and Canada, plus parts of Mexico. It frequently appears in technology, entertainment, gaming, cloud infrastructure, and trans-Pacific operations, where teams based on the Pacific coast need to communicate with Europe and Africa.

Greenwich Mean Time is widely recognized because of its connection to the United Kingdom and multiple countries in West Africa and the Atlantic region. It is commonly used in international scheduling, aviation references, shipping communication, government coordination, and cross-border business where a neutral baseline or UK-linked schedule is needed.

For practical planning, this means Pacific Standard Time often represents origin-side scheduling for West Coast offices, while Greenwich Mean Time often represents destination-side timing for UK partners or organizations operating across GMT countries. If a company in California wants a same-day response from a London contact, the best chance usually comes during the Pacific Standard Time morning rather than later in the afternoon.

Frequently Asked Questions

What is the time difference between Pacific Standard Time and Greenwich Mean Time?

Pacific Standard Time is 8 hours behind Greenwich Mean Time, and Greenwich Mean Time is 8 hours ahead of Pacific Standard Time. In practical terms, 9:00 PST equals 17:00 GMT, so a morning meeting on the US West Coast appears in the late afternoon for GMT participants.

Is GMT always 8 hours ahead of Pacific Standard Time?

For this comparison, yes: Greenwich Mean Time is 8 hours ahead of Pacific Standard Time. This page is specifically about Pacific Standard Time and Greenwich Mean Time as standard-time abbreviations, not their daylight-saving counterparts, so the relationship shown here is the UTC-8 to UTC+0 comparison.

What are good meeting times between Pacific Standard Time and Greenwich Mean Time?

Morning hours in Pacific Standard Time are usually the most practical because they map to late afternoon or early evening in Greenwich Mean Time. For example, 9:00 PST = 17:00 GMT and 12:00 PST = 20:00 GMT, which can still work for international client calls, project check-ins, and cross-border support coordination.

Why do late Pacific Standard Time meetings become difficult for Greenwich Mean Time participants?

The 8-hour gap pushes Greenwich Mean Time far later into the day. A 15:00 PST meeting is 23:00 GMT, and 18:00 PST is 2:00 GMT the next day, so late Pacific Standard Time scheduling often falls outside standard office hours for teams in the United Kingdom, Ireland, Iceland, Ghana, or other GMT locations.

Does Pacific Standard Time observe daylight saving time?

Pacific Standard Time is the standard-time abbreviation, and its daylight-saving counterpart is PDT. That matters because organizations in the United States, Canada, and Mexico may refer to Pacific Standard Time in winter schedules but switch terminology seasonally, which can affect how recurring meetings are labeled.

Does Greenwich Mean Time change during daylight saving time?

Greenwich Mean Time is also a standard-time abbreviation, and its daylight-saving counterpart is BST. This is especially relevant for the United Kingdom and nearby jurisdictions, where a meeting described as GMT in one part of the year may be described differently during the daylight-saving period.

Which countries use Pacific Standard Time and Greenwich Mean Time?

Pacific Standard Time is used in Canada, Mexico, and the United States. Greenwich Mean Time 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, making this comparison useful for international trade, outsourcing, and multinational team scheduling.

Is PST Pacific Standard Time or Pitcairn Standard Time?

On this page, PST means Pacific Standard Time, which is UTC-8. PST can also mean Pitcairn Standard Time, also UTC-8, and if you need that meaning, use /time-converter/pst-pitcairn-time-zone instead.