What is the time difference between GMT and PST?

Pacific Standard Time (PST) is 8 hours behind Greenwich Mean Time (GMT). GMT uses a UTC offset of UTC+1, while PST uses UTC-7. For example, when it's 9:00 AM in GMT, it's 1:00 AM in PST. Note that this difference may shift by one hour during daylight saving time transitions if the two zones change on different dates. Use the conversion table above to see the exact time for each hour of the day.

How do I convert GMT to PST?

To convert GMT to PST, subtract 8 hours from the GMT time. For example, 9:00 AM GMT is 1:00 AM PST, and 5:00 PM GMT is 9:00 AM PST. Keep in mind that during daylight saving time transitions, the offset between these timezones may temporarily change by one hour. You can also use the interactive converter above for quick, accurate results.

What time is it in PST when it's noon in GMT?

When it's 12:00 PM (noon) in GMT, it's 4:00 AM in PST. This is because PST is 8 hours behind GMT. Similarly, when it's 6:00 PM in GMT, it's 10:00 AM in PST. During daylight saving time transitions, these times may shift by one hour, so always verify the current offset. The color-coded conversion table above shows every hour mapped between both timezones.

How many hours behind is PST from GMT?

PST is 8 hours behind GMT. This means when it's 9:00 AM in GMT, it's 1:00 AM in PST, and when it's midnight in GMT, it's 4:00 PM in PST. The exact difference can vary by one hour during daylight saving time transitions. The conversion table above provides a complete hour-by-hour mapping.

Is PST ahead or behind GMT?

PST is behind GMT by 8 hours. Clocks in PST show an earlier time than GMT, meaning the day starts later in PST relative to GMT. For example, when it's noon in GMT, it's still 4:00 AM in PST. This gap may change by one hour during DST transitions.

Does GMT observe daylight saving time?

Yes, Greenwich Mean Time observes daylight saving time. During DST, the abbreviation changes to BST and clocks move forward by one hour, typically in spring. Clocks then fall back in autumn, returning to standard GMT time. This means the UTC offset for GMT shifts between two values depending on the season. Check our DST change calendar for exact transition dates that may affect your GMT to PST conversions.

Does PST observe daylight saving time?

Yes, Pacific Standard Time observes daylight saving time. During DST, the abbreviation changes to PDT and clocks move forward by one hour, typically in spring. Clocks then fall back in autumn, returning to standard PST time. This means the UTC offset for PST shifts between two values depending on the season. Check our DST change calendar for exact transition dates that may affect your GMT to PST conversions.

What is the best time to call from GMT to PST?

The best time for a call between GMT and PST is during overlapping business hours (9 AM – 5 PM) in both timezones. To reach someone in PST during their work day, call between 5:00 PM and 1:00 AM your GMT time. Avoid calling too early or late, as the 8 hours difference means your evening could be their early morning. Check the color-coded conversion table above — green hours indicate business hours in both zones, making it easy to find the ideal time.

When does daylight saving time change in GMT?

Daylight saving time transitions vary by year and region. Greenwich Mean Time observes DST, which typically shifts clocks forward by one hour in spring ("spring forward") and back in fall ("fall back"). During these transition periods, the time difference between GMT and PST may temporarily change by one hour, which can cause confusion for scheduled meetings or calls. It's important to double-check your conversions around transition dates, especially if the two timezones switch on different dates. Check our DST change calendar for exact transition dates in the current year.

Do GMT and PST ever have the same time?

No, GMT and PST are always 8 hours apart and never display the same clock time simultaneously. Both timezones observe DST and typically transition around the same period, so the standard difference remains consistent throughout the year. The 8 hours offset is determined by their fixed positions relative to the Prime Meridian (UTC). You can always rely on this consistent difference when planning across these timezones.

GMT to PST Converter

Convert Greenwich Mean Time to Pacific Standard Time. See the hour-by-hour conversion table below.

Timezone Details

Greenwich Mean Time

11:54 PM

Thursday, April 2, 2026

BST (UTC+01:00)

Pacific Standard Time

3:54 PM

Thursday, April 2, 2026

PDT (UTC-07:00)

Difference: -8 hours

BST DST: Yes (BST)

PDT DST: Yes (PDT)

24-Hour Overview

BST — 24-hour overview

12a12a

3a3a

6a6a

9a9a

10a

11a

12p12p

3p3p

6p6p

9p9p

10p

11p

NightMorningBusinessEvening

PDT — 24-hour overview

4p4p

7p7p

10p10p

11p

12a

1a1a

4a4a

7a7a

10a10a

11a

12p

1p1p

NightMorningBusinessEvening

Frequently Asked Questions

Related Conversions

PST to GMT EST to PST PST to EST EST to GMT GMT to EST PST to IST IST to PST PST to JST JST to PST

Cities in These Timezones

GMT Cities

London Manchester Edinburgh

PST Cities

Los Angeles San Diego San Francisco Seattle Las Vegas

More Tools

Compare GMT & PST Plan a Meeting (GMT & PST)See on Map

Learn More

How Time Zones Work Understanding DST Timezone Abbreviations

External Resources

Greenwich Mean Time on Wikipedia Pacific Standard Time on Wikipedia IANA Time Zone Database