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Convert GMT/BST (London) to UTC (Coordinated Universal Time)
Convert GMT to UTC with an hour-by-hour table
- Hour-by-hour table
- Warns on clock changes
- Runs on your device
15:27=14:27
London (UTC+01:00) → UTC (UTC), 2026-10-15
- Working hours
- 09:00–17:00 in London is 08:00–16:00 in UTC.
- Good time to call
- 10:00–17:00 in London, which is 09:00–16:00 in UTC.
The difference is -1:00 right now, but it does not hold all year:
- 25 Oct 2026 to 28 Mar 2027: 0
- London moves its clocks back on 25 Oct 2026, 02:00 → 01:00 (9 days away).
London to UTC, hour by hour
One row every 60 minutes
| London | UTC | Day |
|---|---|---|
| 00:00 | 23:00 | Previous day |
| 01:00 | 00:00 | Same day |
| 02:00 | 01:00 | Same day |
| 03:00 | 02:00 | Same day |
| 04:00 | 03:00 | Same day |
| 05:00 | 04:00 | Same day |
| 06:00 | 05:00 | Same day |
| 07:00 | 06:00 | Same day |
| 08:00 | 07:00 | Same day |
| 09:00 | 08:00 | Same day |
| 10:00 | 09:00 | Same day |
| 11:00 | 10:00 | Same day |
| 12:00 | 11:00 | Same day |
| 13:00 | 12:00 | Same day |
| 14:00 | 13:00 | Same day |
| 15:00 | 14:00 | Same day |
| 16:00 | 15:00 | Same day |
| 17:00 | 16:00 | Same day |
| 18:00 | 17:00 | Same day |
| 19:00 | 18:00 | Same day |
| 20:00 | 19:00 | Same day |
| 21:00 | 20:00 | Same day |
| 22:00 | 21:00 | Same day |
| 23:00 | 22:00 | Same day |
The time in the source zone. Enter one that does not exist and the tool says so.
How far apart the rows of the table are.
What to do when a time does not exist, or happens twice, because clocks changed.
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Why Convert GMT/BST (London) to UTC (Coordinated Universal Time)?
Converting GMT/BST (London) to UTC (Coordinated Universal Time) enables international communication, facilitates scheduling across time zones, supports business operations, and ensures accurate time coordination between these regions.
Benefits of Time Zone Conversion
- International Communication: Coordinate meetings and calls across time zones
- Scheduling: Plan events and appointments accurately
- Business Operations: Support global business operations
- Travel Planning: Plan travel and adjust to local time
- Time Coordination: Ensure accurate time coordination
How to use this converter
Enter date and time
Enter the date and time in GMT/BST (London), or click "Set to now" for the current moment.
View converted time
The same instant is shown in UTC (Coordinated Universal Time). Conversion runs on your device; no server is used.
Copy or export
Use Copy to paste the result elsewhere, or ISO 8601 (UTC) for a standard UTC timestamp.
GMT/BST (London) vs UTC (Coordinated Universal Time): Understanding the Difference
Understanding the differences between GMT/BST (London) and UTC (Coordinated Universal Time) helps you coordinate time across these time zones.
GMT/BST (London) Characteristics
- IANA identifier: Europe/London
- Current offset: UTC+1
- DST: Yes (BST in summer)
UTC (Coordinated Universal Time) Characteristics
- IANA identifier: UTC
- Current offset: UTC+0
- DST: No DST
Quick reference
Time difference: -1 hours — UTC is 1 hours behind GMT
| Time zone | IANA identifier | Current offset | DST |
|---|---|---|---|
| GMT/BST (London) | Europe/London | UTC+1 | Yes (BST in summer) |
| UTC (Coordinated Universal Time) | UTC | UTC+0 | No DST |
Technical note
Times you type are read as local time in the selected zone. Conversions use the IANA time zone rules your device already carries for its own clock, so results agree with your operating system rather than with a server. For anything legally binding, confirm with an authoritative source.
Clock Changes for GMT and UTC
The dates below are worked out when this page is built, from the same time zone rules the converter uses. Nothing here is written down, so nothing here can be a year out of date.
- London moves its clocks back on 25 Oct 2026, 02:00 → 01:00 (9 days away).
- London moves its clocks forward on 28 Mar 2027, 01:00 → 02:00 (163 days away).
Weeks when the difference is not its usual one
The difference is -1:00 right now, but it does not hold all year:
- 25 Oct 2026 to 28 Mar 2027: 0
When to Convert GMT/BST (London) to UTC (Coordinated Universal Time)
Convert GMT/BST (London) to UTC (Coordinated Universal Time) when you need to coordinate time between these regions, schedule international meetings, or plan travel.
Ideal Use Cases
- International Meetings: Schedule meetings between these time zones
- Business Operations: Coordinate business activities across time zones
- Travel Planning: Plan travel and adjust to local time
- Communication: Coordinate calls and communications
- Event Scheduling: Schedule events across time zones
When to convert GMT/BST (London) to UTC (Coordinated Universal Time)
- Meetings: Schedule calls and events across GMT/BST (London) and UTC (Coordinated Universal Time).
- Travel: See local time at your destination before you go.
- Work: Coordinate with remote teams or clients in the other time zone.
- Events: Publish start times in both zones so everyone sees the correct local time.
Example Conversions: What Time Is X in UTC?
Common searches: 8 PM GMT in UTC, 9 AM GMT in UTC, what time is 5 PM GMT in UTC. Use the converter above to enter any time in GMT/BST (London) and see the equivalent in UTC (Coordinated Universal Time) instantly. The conversion is second-accurate and accounts for daylight saving time.
Time Zone Conversion Facts
Understanding these facts helps you make better use of time zone conversion tools.
Key Statistics
- Current time difference: -1 hours (GMT to UTC)
- Time difference varies with daylight saving time where applicable
- Conversion accounts for daylight saving time changes automatically
- Our converter uses the IANA time zone database for second-accurate results
- Real-time conversion ensures accuracy
- Time zones are based on geographic location and political boundaries
Best Practices
Follow these guidelines to achieve accurate time zone conversion results.
Quality Considerations
- Verify daylight saving time status for both time zones
- Check current time difference before scheduling
- Consider daylight saving time transitions
- Use real-time conversion for accuracy
- Double-check conversions for important events
When Not to Use
- Don't use for historical dates without verifying daylight saving time
- Avoid using for dates far in the future (DST rules may change)
- If precise time is critical, verify with official sources
- Don't use for legal or official time requirements
Other Converters for These Zones
Frequently asked questions
What is the time difference between GMT and UTC?
UTC is 1 hours behind GMT. The difference varies with daylight saving time. Use the converter above to see the exact difference for any date and time.
Is the conversion accurate?
Yes. The tool uses the IANA time zone database (same as most operating systems and programming languages). Daylight saving time (DST) and historical offset changes are applied automatically. Conversion is second-accurate.
Is my data sent to a server?
No. It all runs on your device, not our servers.
What is ISO 8601 (UTC)?
It is a standard format for a single moment in time, expressed in UTC (e.g. 2025-02-02T14:30:00.000Z). Useful for APIs, contracts, and storing timestamps in a time-zone-neutral way.
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