GMT to PDT Converter
Convert time between Greenwich Mean Time (GMT) and Pacific Daylight Time (PDT)
Greenwich Mean Time (GMT)
Pacific Daylight Time (PDT)
Time Difference
Pacific Daylight Time (PDT) is 0 hours ahead of Greenwich Mean Time (GMT)
Select Date
Select Time
Quick Reference
| GMT | PDT |
|---|---|
| 02:00 | 18:00 |
| 04:00 | 20:00 |
| 06:00 | 22:00 |
| 08:00 | 00:00 |
| 10:00 | 02:00 |
| 12:00 | 04:00 |
| 14:00 | 06:00 |
| 16:00 | 08:00 |
| 18:00 | 10:00 |
| 20:00 | 12:00 |
| 22:00 | 14:00 |
| 00:00 | 16:00 |
Top 10 Most Common Time Zones
| Abbreviation | Full Name | UTC Offset | Typical Use |
|---|---|---|---|
| UTC | Coordinated Universal Time | UTC ±0 | Global reference standard (servers, logs, APIs) |
| EST / EDT | Eastern (US) Time | UTC −5 / −4 | New York, Toronto — North American business hub |
| CST / CDT | Central (US) Time | UTC −6 / −5 | Chicago, Dallas — US central business region |
| PST / PDT | Pacific (US) Time | UTC −8 / −7 | San Francisco, Los Angeles — tech industry standard |
| GMT / BST | Greenwich Mean / British Summer Time | UTC 0 / +1 | UK, used globally as a reference with UTC |
| CET / CEST | Central European (Summer) Time | UTC +1 / +2 | Paris, Berlin, Amsterdam — EU business core |
| IST | India Standard Time | UTC +5:30 | India — major IT & outsourcing region |
| CST | China Standard Time | UTC +8 | Beijing, Shanghai — East Asia business hub |
| JST | Japan Standard Time | UTC +9 | Tokyo — finance & tech hub |
| AEST / AEDT | Australian Eastern (Daylight) Time | UTC +10 / +11 | Sydney, Melbourne — APAC regional business |
Why Time Zone Abbreviations Are Ambiguous
Unlike standardized identifiers (like America/New_York or Europe/London from the IANA tz database), abbreviations such as "CST" or "IST" are not globally unique. They can refer to different time zones depending on context — country, region, or even time of year (due to daylight saving time).
Common Ambiguous Time Zone Abbreviations
| Abbrev. | Common Meaning(s) | UTC Offset | Region(s) |
|---|---|---|---|
| CST | Central Standard Time / China Standard Time / Cuba Standard Time | UTC−6 / UTC+8 / UTC−5 | North America, China, Cuba |
| IST | Indian Standard Time / Irish Standard Time / Israel Standard Time | UTC+5:30 / UTC+1 / UTC+2 | India, Ireland, Israel |
| AST | Atlantic Standard Time / Arabia Standard Time | UTC−4 / UTC+3 | Caribbean, Canada, Middle East |
| PST | Pacific Standard Time / Philippine Standard Time | UTC−8 / UTC+8 | North America, Philippines |
| EST | Eastern Standard Time (North America / Australia) | UTC−5 / UTC+10 | North America, Australia |
✅ Best Practice
To avoid ambiguity, always:
- Use IANA tz identifiers — e.g.,
America/New_Yorkinstead of "EST" - Specify UTC offset explicitly — e.g.,
UTC−5when abbreviations must be used - Include the full timezone name — e.g., "Eastern Standard Time (EST)" with UTC offset
Related Time Zone Conversions
About GMT to PDT Time Conversion
Converting time from Greenwich Mean Time (GMT) to Pacific Daylight Time (PDT) is essential for UK to US West Coast coordination. GMT is UTC+0, while PDT is UTC-7, making PDT 7 hours behind GMT.
This conversion is crucial for international business operations between the United Kingdom and the US West Coast, including major tech and entertainment hubs in California, Washington, and Oregon. Whether you're scheduling meetings, coordinating project deadlines, or planning travel, our accurate IANA-based converter ensures you never miss the time difference.
Common Use Cases for GMT to PDT Conversion
Business & Work
- Scheduling UK to US West Coast business meetings
- Coordinating London and Silicon Valley tech operations
- Managing international entertainment and media operations
- Planning conference calls with distributed teams
Personal & Travel
- Planning travel from UK to US West Coast (California, Washington)
- Coordinating with US West Coast family and friends from UK
- Scheduling virtual events and online meetings for UK-US West Coast audiences
- Arranging online classes or training sessions
Time Zone Information
Greenwich Mean Time (GMT)
- UTC Offset: UTC+0 (UTC+1 during BST)
- IANA Timezone: Europe/London
- Daylight Saving: Last Sunday in March to Last Sunday in October
- Major Cities: London, Edinburgh, Cardiff, Belfast, Dublin
- Coverage: United Kingdom and Ireland
Pacific Daylight Time (PDT)
- UTC Offset: UTC-7 (UTC-8 during PST)
- IANA Timezone: America/Los_Angeles
- Daylight Saving: Second Sunday in March to First Sunday in November
- Major Cities: Los Angeles, San Francisco, Seattle, Portland, San Diego
- Coverage: Pacific Coast of United States and Canada
Quick Reference: GMT to PDT
Remember: PDT is always 7 hours behind GMT. This conversion applies from second Sunday in March to first Sunday in November when PDT is active.
Frequently Asked Questions
What is the time difference between GMT and PDT?
Greenwich Mean Time (GMT) is UTC+0, while Pacific Daylight Time (PDT) is UTC-7. This means GMT is 7 hours ahead of PDT. When it's 12:00 PM (noon) in London (GMT), it's 5:00 AM in Los Angeles (PDT).
How does PDT differ from PST in terms of the GMT offset?
PDT (Pacific Daylight Time) is UTC-7, making it 7 hours behind GMT. PST (Pacific Standard Time) is UTC-8, making it 8 hours behind GMT. The difference between the two is 1 hour, with PDT being 1 hour ahead of PST. PDT is active from March to November, while PST is active from November to March.
Does the UK use GMT year-round?
No, the UK switches between GMT (UTC+0) in winter and BST (British Summer Time, UTC+1) in summer. BST is active from the last Sunday in March to the last Sunday in October. This means when the UK observes BST, the time difference to PDT becomes only 8 hours instead of 7.
When does PDT end and timezone transitions occur?
PDT ends on the first Sunday in November when Pacific Time transitions to PST. At the same time, the UK transitions from BST to GMT. This means the time difference between UK and US West Coast changes from 8 hours (BST to PDT) to 8 hours (GMT to PST). The transitions happen on the same date but create different offsets.
What are the best times to schedule calls between UK and US West Coast?
Morning in the UK (8-10 AM GMT) overlaps with late evening/night in the US (1-3 AM PDT), which is not ideal. Afternoon in the UK (3-5 PM GMT) overlaps with early morning in the US (8-10 AM PDT). For business operations, 4-5 PM UK time provides the most convenient overlap with US West Coast business hours.
Why is GMT to PDT conversion important?
GMT to PDT conversion is essential for coordinating between the United Kingdom and the US West Coast, home to major tech and entertainment hubs like San Francisco, Los Angeles, and Seattle. This conversion is vital for international tech partnerships, entertainment industry coordination, and personal communications between these regions.
Pro Tips
- • The 7-hour difference means 8 AM in London equals 1 AM in Los Angeles - very early! Plan calls strategically to avoid extreme hours on the West Coast.
- • When GMT ends and PDT ends on the first Sunday of November, both regions transition simultaneously - GMT to PST and PDT to PST, changing the offset.
- • Schedule important UK-US West Coast meetings in late afternoon UK time (4-5 PM GMT, 9-10 AM PDT) to get the best overlap of working hours.
- • Remember that the UK will be on BST (8-hour difference) from late March to late October, not GMT (7-hour difference).
- • Use the 5 PM GMT window (10 AM PDT) for morning meetings on the US West Coast while still catching UK business hours.
- • For 24/7 operations with UK-US West Coast teams, split-shift scheduling is essential - UK evening/night covers US morning, and vice versa.
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