PDT to GMT Converter
Convert time between Pacific Daylight Time (PDT) and Greenwich Mean Time (GMT)
Pacific Daylight Time (PDT)
Greenwich Mean Time (GMT)
Time Difference
Greenwich Mean Time (GMT) is 0 hours ahead of Pacific Daylight Time (PDT)
Select Date
Select Time
Quick Reference
| PDT | GMT |
|---|---|
| 18:00 | 02:00 |
| 20:00 | 04:00 |
| 22:00 | 06:00 |
| 00:00 | 08:00 |
| 02:00 | 10:00 |
| 04:00 | 12:00 |
| 06:00 | 14:00 |
| 08:00 | 16:00 |
| 10:00 | 18:00 |
| 12:00 | 20:00 |
| 14:00 | 22:00 |
| 16:00 | 00:00 |
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 PDT to GMT Time Conversion
Converting time from Pacific Daylight Time (PDT) to Greenwich Mean Time (GMT) is essential for coordinating between the US West Coast and the United Kingdom. PDT is UTC-7, while GMT is UTC+0, making GMT 7 hours ahead of PDT during the daylight saving time period (March to November).
This converter uses the IANA timezone database to ensure accurate calculations for transatlantic business operations. Whether you're scheduling international meetings, managing distributed teams, or coordinating projects with the UK, this tool provides reliable real-time conversions for seamless global coordination.
Common Use Cases for PDT to GMT Conversion
Business & Work
- Scheduling transatlantic business meetings between US West Coast and UK
- Coordinating with UK-based team members and remote workers
- Managing international software development with London offices
- Syncing with London financial markets and trading operations
Personal & Travel
- Planning international travel from Pacific to UK
- Coordinating with friends and family in the UK
- Attending UK-based conferences and virtual events
- Tracking UK events and live broadcasts from US West Coast
Time Zone Information
Pacific Daylight Time (PDT)
- UTC Offset: UTC-7
- IANA Timezone: America/Los_Angeles
- Daylight Saving: Second Sunday in March to First Sunday in November
- Major Cities: Los Angeles, San Francisco, Seattle, San Diego, Portland
- Coverage: Pacific United States and Canada
Greenwich Mean Time (GMT)
- UTC Offset: UTC+0
- IANA Timezone: Europe/London
- Daylight Saving: GMT is standard time (UTC+0). BST (UTC+1) is March to October
- Major Cities: London, Greenwich, Edinburgh, Belfast, Cardiff
- Coverage: United Kingdom, Ireland, and parts of Western Europe
Quick Reference: PDT to GMT
Note: GMT is always 7 hours ahead of PDT (March - November). During standard time (November - March), PST is UTC-8, making GMT 8 hours ahead.
Frequently Asked Questions
What is the time difference between PDT and GMT?
PDT (Pacific Daylight Time) is UTC-7, while GMT (Greenwich Mean Time) is UTC+0, making GMT 7 hours ahead of PDT. This means when it is noon in Los Angeles (PDT), it is already 7:00 PM the same day in London (GMT).
How does PDT differ from PST?
PDT (Pacific Daylight Time) is UTC-7 and is observed during daylight saving time (March to November), while PST (Pacific Standard Time) is UTC-8 and is observed during standard time (November to March). This one-hour difference is important when scheduling across seasons.
Does GMT observe daylight saving time?
No, GMT (Greenwich Mean Time) does not observe daylight saving time. However, the UK uses BST (British Summer Time) during daylight saving periods. GMT remains UTC+0 year-round and is used as a global standard reference. During BST (late March to late October), the UK is UTC+1.
When does PDT change to PST?
Pacific Daylight Time (PDT) transitions to Pacific Standard Time (PST) on the first Sunday in November at 2:00 AM. The reverse transition from PST to PDT occurs on the second Sunday in March at 2:00 AM. During PST, the time difference with GMT is 8 hours instead of 7.
How do I convert PDT to GMT manually?
To convert PDT to GMT, simply add 7 hours to the PDT time. For example, if it is 3:00 PM PDT, the corresponding GMT time would be 10:00 PM (15:00 + 7 hours = 22:00). If the result exceeds 24 hours, subtract 24 hours and add 1 day.
Why is understanding PDT to GMT conversion important?
Understanding PDT to GMT conversion is crucial for coordinating with teams and businesses in the UK and Europe, international travel planning, virtual meetings across the Atlantic, and global communication. The 7-hour difference makes accurate conversion essential for business operations.
Pro Tips
- • PDT is only observed from March to November. From November to March, the Pacific region uses PST (Pacific Standard Time) with an 8-hour difference from GMT.
- • GMT is equivalent to UTC (Coordinated Universal Time) and serves as the global reference time used for aviation and international business.
- • The UK switches to BST (British Summer Time) at the same dates as PDT transitions, so the time difference remains consistent during daylight saving overlaps.
- • When scheduling international meetings between Pacific US and UK, early morning PDT (7-8 AM) aligns with late afternoon/evening GMT (2-3 PM), making it ideal for both regions.
- • Use a converter like this one for daylight saving transitions to avoid miscalculations when PDT switches to PST and GMT switches to BST.
- • Always verify whether your meeting participants are observing daylight saving time, as transition dates can vary between the US and UK by a few weeks.
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