How many hours behind GMT is PST?

Pacific Standard Time (PST, UTC−8) is 8 hours behind GMT (UTC+0) during winter. In summer, when California is on PDT (UTC−7) and the UK is on BST (UTC+1), the gap is still 8 hours. During brief DST transition windows in March and October, the gap can temporarily be 7 or 9 hours.

Is there any reasonable overlap between PST and GMT business hours?

Barely. The PST/GMT overlap is extremely narrow. Standard London business hours end at 6 PM GMT, which is only 10 AM PST. Any meeting that works for both must have London staying late or San Francisco starting early. The 4–6 PM GMT window (8–10 AM PST) is the only viable zone for routine calls.

Why is scheduling between California and the UK harder than California and New York?

New York is only 3 hours ahead of California, leaving several hours of comfortable overlap. The UK is 8 hours ahead in winter, which eliminates almost all overlap within standard business hours. By the time San Francisco starts its day at 9 AM PST, London is already at 5 PM GMT and close to finishing.

PST vs GMT: Time Difference and Conversion

February 21, 2026

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Frequently Asked Questions

How many hours behind GMT is PST?: Pacific Standard Time (PST, UTC−8) is 8 hours behind GMT (UTC+0) during winter. In summer, when California is on PDT (UTC−7) and the UK is on BST (UTC+1), the gap is still 8 hours. During brief DST transition windows in March and October, the gap can temporarily be 7 or 9 hours.
Is there any reasonable overlap between PST and GMT business hours?: Barely. The PST/GMT overlap is extremely narrow. Standard London business hours end at 6 PM GMT, which is only 10 AM PST. Any meeting that works for both must have London staying late or San Francisco starting early. The 4–6 PM GMT window (8–10 AM PST) is the only viable zone for routine calls.
Why is scheduling between California and the UK harder than California and New York?: New York is only 3 hours ahead of California, leaving several hours of comfortable overlap. The UK is 8 hours ahead in winter, which eliminates almost all overlap within standard business hours. By the time San Francisco starts its day at 9 AM PST, London is already at 5 PM GMT and close to finishing.