BST to GMT Converter
Convert British Summer Time (BST) to Greenwich Mean Time (GMT) in seconds. Whether you’re scheduling meetings, planning travel, or coordinating across time zones, this converter makes it dead simple.
Recent Conversions
BST to GMT Conversion Table
Here’s a quick reference showing BST times converted to GMT. During British Summer Time, simply subtract one hour to get GMT.
| BST Time | GMT Time |
|---|---|
| 00:00 (Midnight) | 23:00 (Previous day) |
| 01:00 | 00:00 (Midnight) |
| 02:00 | 01:00 |
| 03:00 | 02:00 |
| 04:00 | 03:00 |
| 05:00 | 04:00 |
| 06:00 | 05:00 |
| 07:00 | 06:00 |
| 08:00 | 07:00 |
| 09:00 | 08:00 |
| 10:00 | 09:00 |
| 11:00 | 10:00 |
| 12:00 (Noon) | 11:00 |
| 13:00 | 12:00 (Noon) |
| 14:00 | 13:00 |
| 15:00 | 14:00 |
| 16:00 | 15:00 |
| 17:00 | 16:00 |
| 18:00 | 17:00 |
| 19:00 | 18:00 |
| 20:00 | 19:00 |
| 21:00 | 20:00 |
| 22:00 | 21:00 |
| 23:00 | 22:00 |
How the Conversion Works
Converting between BST and GMT is straightforward once you know the basics. The key thing to remember is that BST is always one hour ahead of GMT during the summer months.
Step-by-Step Conversion
- Check if you’re currently in BST period (late March through late October)
- Take your BST time
- Subtract one hour to get GMT
- If converting GMT to BST, add one hour instead
- Watch out for midnight crossovers – times before 01:00 BST fall on the previous day in GMT
When the Clocks Change
Britain shifts between GMT and BST twice yearly. The clocks spring forward in March and fall back in October, always on the last Sunday of those months.
| Year | Clocks Forward (GMT → BST) | Clocks Back (BST → GMT) |
|---|---|---|
| 2025 | 30 March, 01:00 | 26 October, 02:00 |
| 2026 | 29 March, 01:00 | 25 October, 02:00 |
| 2027 | 28 March, 01:00 | 31 October, 02:00 |
| 2028 | 26 March, 01:00 | 29 October, 02:00 |
What This Means in Practice
The time zone shift affects millions of people daily. Here’s how different situations play out:
International Meetings
If you’re based in London scheduling a call with someone in a GMT location during summer, remember your 2:00 PM is their 1:00 PM. Many calendar apps handle this automatically, but it’s worth double-checking.
Broadcasting and Live Events
TV schedules, sports fixtures, and live streams often list times in both BST and GMT during summer. Premier League matches shown at 3:00 PM BST would be 2:00 PM GMT for viewers in locations that don’t observe daylight saving.
Travel Considerations
Flying into London during summer from a GMT location? Your arrival time in BST will be one hour later than the GMT departure time zone. Double-check your tickets to see which time zone they reference.
Business Hours
Companies operating across multiple regions need to account for this shift. A London office open 9:00-17:00 BST translates to 8:00-16:00 GMT, affecting coordination with international branches.
Time Zone Conversions
Beyond BST and GMT, here’s how these time zones relate to other common standards:
| Time Zone | Difference from BST | Difference from GMT |
|---|---|---|
| UTC | BST is +1 hour | GMT is same as UTC |
| CET (Central European Time) | Same time | CET is +1 hour |
| EST (Eastern Standard Time) | BST is +5 hours | GMT is +5 hours |
| PST (Pacific Standard Time) | BST is +8 hours | GMT is +8 hours |
| AEST (Australian Eastern Standard Time) | BST is -9 hours | GMT is -10 hours |
| IST (India Standard Time) | BST is -4.5 hours | GMT is -5.5 hours |