GMT to EDT Converter
Convert time between Greenwich Mean Time (GMT) and Eastern Daylight Time (EDT)
Greenwich Mean Time (GMT)
Eastern Daylight Time (EDT)
Time Difference
Eastern Daylight Time (EDT) is 0 hours ahead of Greenwich Mean Time (GMT)
Select Date
Select Time
Quick Reference
| GMT | EDT |
|---|---|
| 02:00 | 21:00 |
| 04:00 | 23:00 |
| 06:00 | 01:00 |
| 08:00 | 03:00 |
| 10:00 | 05:00 |
| 12:00 | 07:00 |
| 14:00 | 09:00 |
| 16:00 | 11:00 |
| 18:00 | 13:00 |
| 20:00 | 15:00 |
| 22:00 | 17:00 |
| 00:00 | 19:00 |
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 EDT Time Conversion
Converting time from Greenwich Mean Time (GMT) to Eastern Daylight Time (EDT) is essential for UK to US East Coast coordination. GMT is UTC+0, while EDT is UTC-4, making EDT 4 hours behind GMT.
This conversion is crucial for international business operations between the United Kingdom and the US East Coast, including major financial centers, technology hubs, and corporate headquarters. 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 EDT Conversion
Business & Work
- Scheduling UK to US East Coast business meetings
- Coordinating London and New York financial operations
- Managing international tech partnerships and collaborations
- Planning conference calls with distributed teams
Personal & Travel
- Planning travel from UK to US East Coast
- Coordinating with US East Coast family and friends from UK
- Scheduling virtual events and online meetings for UK-US 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
Eastern Daylight Time (EDT)
- UTC Offset: UTC-4 (UTC-5 during EST)
- IANA Timezone: America/New_York
- Daylight Saving: Second Sunday in March to First Sunday in November
- Major Cities: New York, Philadelphia, Atlanta, Miami, Boston, Washington DC
- Coverage: Eastern United States and Eastern Canada
Quick Reference: GMT to EDT
Remember: EDT is always 4 hours behind GMT. This conversion applies from second Sunday in March to first Sunday in November when EDT is active.
Frequently Asked Questions
What is the time difference between GMT and EDT?
Greenwich Mean Time (GMT) is UTC+0, while Eastern Daylight Time (EDT) is UTC-4. This means GMT is 4 hours ahead of EDT. When it's 12:00 PM (noon) in London (GMT), it's 8:00 AM in New York (EDT).
How does EDT differ from EST in terms of the GMT offset?
EDT (Eastern Daylight Time) is UTC-4, making it 4 hours behind GMT. EST (Eastern Standard Time) is UTC-5, making it 5 hours behind GMT. The difference between the two is 1 hour, with EDT being 1 hour ahead of EST. EDT is active from March to November, while EST 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 EDT becomes only 5 hours instead of 4.
When does EDT end and when does GMT transitions occur?
EDT ends on the first Sunday in November when Eastern Time transitions to EST. At the same time, the UK transitions from BST to GMT. This means the time difference between UK and US East Coast changes from 5 hours (BST to EDT) to 5 hours (GMT to EST). The transitions happen on the same date but create different offsets.
What are the best times to schedule calls between UK and US East Coast?
Morning in the UK (8-10 AM GMT) overlaps with late evening in the US (3-5 PM EDT). Afternoon in the UK (3-5 PM GMT) overlaps with morning in the US (11 AM-1 PM EDT). For business operations, 8-10 AM UK time provides the most convenient overlap with US business hours.
Why is GMT to EDT conversion important?
GMT to EDT conversion is essential for coordinating between the United Kingdom and the US East Coast, home to major financial centers like London and New York. This conversion is vital for international business, finance, technology partnerships, and personal communications between these major business regions.
Pro Tips
- • When GMT ends and EDT ends on the same day in early November, pay careful attention to which timezone you're converting from, as both regions transition simultaneously.
- • The 4-hour difference means 8 AM in London equals 4 AM in New York - very early! Plan calls strategically to avoid extreme hours on either side.
- • Schedule important UK-US East Coast meetings between 8-10 AM GMT and 3-5 PM EDT to get the best overlap of working hours.
- • Remember that the UK will be on BST (5-hour difference) from late March to late October, not GMT (4-hour difference).
- • Use the 9 AM GMT window (5 PM EDT) for afternoon meetings on the US side while still catching UK business hours overlap.
- • For 24/7 operations, split-shift scheduling is essential - a UK morning shift covers US evening/night, and vice versa.
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