EDT to GMT Converter
Convert time between Eastern Daylight Time (EDT) and Greenwich Mean Time (GMT)
Eastern Daylight Time (EDT)
Greenwich Mean Time (GMT)
Time Difference
Greenwich Mean Time (GMT) is 0 hours ahead of Eastern Daylight Time (EDT)
Select Date
Select Time
Quick Reference
| EDT | GMT |
|---|---|
| 21:00 | 02:00 |
| 23:00 | 04:00 |
| 01:00 | 06:00 |
| 03:00 | 08:00 |
| 05:00 | 10:00 |
| 07:00 | 12:00 |
| 09:00 | 14:00 |
| 11:00 | 16:00 |
| 13:00 | 18:00 |
| 15:00 | 20:00 |
| 17:00 | 22:00 |
| 19:00 | 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 EDT to GMT Time Conversion
Converting time from Eastern Daylight Time (EDT) to Greenwich Mean Time (GMT) is essential for US East Coast to UK coordination during summer months. EDT is UTC-4, while GMT is UTC+0, making GMT 4 hours ahead of EDT.
This conversion is crucial for transatlantic business operations, financial markets coordination, and international communications between the US East Coast and the United Kingdom during the daylight saving period.
Common Use Cases for EDT to GMT Conversion
Business & Work
- Scheduling transatlantic business meetings during summer months
- Coordinating financial market activities between US and UK
- Planning international project collaborations during daylight saving season
Personal & Travel
- Planning travel between US East Coast and UK
- Coordinating with UK family and friends during summer
- Scheduling virtual events for US-UK audiences
Time Zone Information
Eastern Daylight Time (EDT)
- UTC Offset: UTC-4
- IANA Timezone: America/New_York
- Daylight Saving: Second Sunday in March to First Sunday in November
- Major Cities: New York, Philadelphia, Atlanta, Miami, Boston
- Coverage: Eastern United States and Canada
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
Quick Reference: EDT to GMT
Remember: GMT is always 4 hours ahead of EDT
Frequently Asked Questions
What is the time difference between EDT and GMT?
EDT (Eastern Daylight Time) is UTC-4, while GMT (Greenwich Mean Time) is UTC+0, making GMT 4 hours ahead of EDT. This means when it is noon in New York (EDT), it is already 4:00 PM the same day in London (GMT).
How does EDT differ from EST?
EDT (Eastern Daylight Time) is UTC-4 and is observed during daylight saving time (March to November), while EST (Eastern Standard Time) is UTC-5 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 EDT change to EST?
Eastern Daylight Time (EDT) transitions to Eastern Standard Time (EST) on the first Sunday in November at 2:00 AM. The reverse transition from EST to EDT occurs on the second Sunday in March at 2:00 AM. During EST, the time difference with GMT is 5 hours instead of 4.
How do I convert EDT to GMT manually?
To convert EDT to GMT, simply add 4 hours to the EDT time. For example, if it is 3:00 PM EDT, the corresponding GMT time would be 7:00 PM (15:00 + 4 hours = 19:00). If the result exceeds 24 hours, subtract 24 hours and add 1 day.
Why is understanding EDT to GMT conversion important?
Understanding EDT 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 4-hour difference makes accurate conversion essential for business operations.
Pro Tips
- • EDT is only observed from March to November. From November to March, the Eastern region uses EST (Eastern Standard Time) with a 5-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 EDT transitions, so the time difference remains consistent during daylight saving overlaps.
- • When scheduling international meetings between Eastern US and UK, early morning EDT (7-8 AM) aligns with 11 AM-12 PM GMT, making it ideal for both regions.
- • Use a converter like this one for daylight saving transitions to avoid miscalculations when EDT switches to EST 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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