BST to EDT Converter
Convert British Summer Time (BST) to Eastern Daylight Time (EDT) instantly. BST is 5 hours ahead of EDT.
Quick Conversions
British Summer Time
Eastern Daylight Time
Time Difference Calculation
Conversion Formula
When it’s 12:00 PM in London (BST), it’s 7:00 AM in New York (EDT)
Key Point: BST is 5 hours ahead of EDT. This means when planning meetings or calls between London and New York, you need to account for this 5-hour time difference. For example, 3:00 PM in London equals 10:00 AM in New York.
Complete Conversion Table
| BST (London) | EDT (New York) | Time Period |
|---|
Meeting Time Planner
Best times for business calls between BST and EDT zones:
Late afternoon in London
Morning hours in New York
Recommendation: Schedule meetings between 2:00 PM – 5:00 PM BST (9:00 AM – 12:00 PM EDT) for optimal overlap during standard business hours in both time zones.
Daylight Saving Changes
BST Period (2025): March 30, 2025 (1:00 AM) to October 26, 2025 (2:00 AM)
EDT Period (2025): March 9, 2025 (2:00 AM) to November 2, 2025 (2:00 AM)
Note: During winter months, UK switches to GMT (UTC+0) and US East Coast switches to EST (UTC-5), maintaining the same 5-hour difference.
Major Cities
United Kingdom
BST
United Kingdom
BST
United Kingdom
BST
United States
EDT
Canada
EDT
Canada
EDT
Conversion Examples
Morning: 8:00 AM BST = 3:00 AM EDT
Noon: 12:00 PM BST = 7:00 AM EDT
Afternoon: 3:00 PM BST = 10:00 AM EDT
Evening: 6:00 PM BST = 1:00 PM EDT
Night: 11:00 PM BST = 6:00 PM EDT
Business Hours Comparison
| Activity | BST Time | EDT Time |
|---|---|---|
| Business Day Start | 9:00 AM | 4:00 AM |
| Morning Meeting Window | 10:00 AM – 12:00 PM | 5:00 AM – 7:00 AM |
| Optimal Call Time | 2:00 PM – 5:00 PM | 9:00 AM – 12:00 PM |
| Business Day End | 5:00 PM | 12:00 PM |
| After Hours | 6:00 PM – 8:00 PM | 1:00 PM – 3:00 PM |
Step-by-Step Conversion
Method 1 – Subtract 5 Hours:
- Start with your BST time
- Subtract 5 hours from the time
- If result is negative, add 12 and change to previous day
- Result is your EDT time
Method 2 – Using UTC:
- Convert BST to UTC by subtracting 1 hour
- Convert UTC to EDT by subtracting 4 hours
- Total difference: 5 hours
Practical Applications
International Business: Companies with offices in London and New York use this conversion daily for scheduling conference calls, video meetings, and coordinating project deadlines across the Atlantic.
Financial Markets: Stock traders monitor market opening times. London Stock Exchange opens at 8:00 AM BST (3:00 AM EDT) while NYSE opens at 2:30 PM BST (9:30 AM EDT).
Travel Planning: When booking flights between UK and US East Coast, accounting for the 5-hour difference helps travelers adjust schedules and minimize jet lag effects.
Remote Work Coordination: Teams distributed across BST and EDT zones plan overlapping work hours, typically 2:00 PM – 6:00 PM BST, ensuring real-time collaboration.
Time Zone Abbreviations
| Abbreviation | Full Name | UTC Offset | Usage Period |
|---|---|---|---|
| BST | British Summer Time | UTC +1 | Late March to Late October |
| GMT | Greenwich Mean Time | UTC +0 | Late October to Late March |
| EDT | Eastern Daylight Time | UTC -4 | Early March to Early November |
| EST | Eastern Standard Time | UTC -5 | Early November to Early March |
Frequently Asked Questions
BST is 5 hours ahead of EDT. This means when it’s noon (12:00 PM) in London during British Summer Time, it’s 7:00 AM in New York during Eastern Daylight Time.
The optimal window is 2:00 PM to 5:00 PM BST, which corresponds to 9:00 AM to 12:00 PM EDT. This period falls within standard business hours for both time zones, making it convenient for all participants.
BST typically starts on the last Sunday of March at 1:00 AM (clocks move forward to 2:00 AM) and ends on the last Sunday of October at 2:00 AM (clocks move back to 1:00 AM). For 2025: March 30 to October 26.
EDT begins on the second Sunday of March at 2:00 AM (clocks move forward to 3:00 AM) and ends on the first Sunday of November at 2:00 AM (clocks move back to 1:00 AM). For 2025: March 9 to November 2.
No, the time difference remains constant at 5 hours throughout the year. During winter, UK uses GMT (UTC+0) and US uses EST (UTC-5), still maintaining the 5-hour gap.
BST is used in the United Kingdom (England, Scotland, Wales, Northern Ireland), as well as the Crown Dependencies: Guernsey, Isle of Man, and Jersey.
EDT is observed in the eastern regions of the United States (including New York, Florida, Georgia), parts of Canada (Ontario, Quebec), the Bahamas, Haiti, and Turks & Caicos Islands.
To convert 3:00 PM BST to EDT, subtract 5 hours: 3:00 PM – 5 hours = 10:00 AM EDT. The calculation is straightforward since EDT is always 5 hours behind BST.
There’s a brief period in March when only one region has switched to daylight saving. From March 9-29, 2025, the difference temporarily changes. However, once both zones are on daylight saving (after March 30), the 5-hour difference resumes.
Yes, but 9:00 AM BST equals 4:00 AM EDT, which is very early for EDT participants. Consider scheduling later in the BST afternoon (2:00 PM or after) to accommodate standard EDT business hours.
Historical Context
British Summer Time: First introduced in 1916 during World War I to save energy. The UK has used BST seasonally ever since, except during World War II when double summer time was implemented.
Eastern Daylight Time: The eastern United States adopted daylight saving time in 1918. The Uniform Time Act of 1966 standardized DST practices across the US, though implementation dates have changed over the years.
Technical Specifications
| Standard | BST Format | EDT Format |
|---|---|---|
| ISO 8601 | +01:00 | -04:00 |
| RFC 2822 | +0100 | -0400 |
| Military Time | Alpha (A) | Quebec (Q) |
| IANA Database | Europe/London | America/New_York |