Time zone · Europe
BST
Guernsey Summer Time
Guernsey Summer Time (BST) covers the Crown Dependencies of Guernsey, Jersey, and the Isle of Man, all running one hour ahead of UTC (UTC+01:00) from the last Sunday in March until clocks fall back on the last Sunday in October, on the same dates as the UK.
Thursday, October 15, 2026
Current offset
UTC+01:00
Daylight · BST
Daylight saving
Active
Reverts 25 Oct 2026
IANA zones
3
3 observe DST, 0 don't
DST offset
—
No summer variant
About BST
Standard time, with a summer shift.
Guernsey Summer Time (BST) covers the Crown Dependencies of Guernsey, Jersey, and the Isle of Man, all running one hour ahead of UTC (UTC+01:00) from the last Sunday in March until clocks fall back on the last Sunday in October, on the same dates as the UK.
IANA zones · the technical identifiers
The 3 zones that resolve to BST.
For software, always store the IANA identifier — never the abbreviation alone. The database keeps these zones distinct because their rules can, and historically did, diverge.
Cities across BST
Local time, city by city.
3 cities
Where BST is used
3 countries.
Same offset · UTC+01:00
Other zones at UTC+01:00 right now.
These named zones share BST's offset today. When daylight saving rules differ, they drift apart for part of the year.
Convert
BST to the world's clocks.
Frequently asked questions
Common questions about BST, daylight saving, and how to handle it in software. Can't find what you need? Email [email protected].
- Why is it called Guernsey Summer Time?
- The name comes from Guernsey, one of the three islands in this group. Locally, Guernsey, Jersey and the Isle of Man all call it British Summer Time (BST), the same as the UK.
- How many places follow this region?
- Three Crown Dependencies follow it: Guernsey, Jersey and the Isle of Man.
- When does the summer offset end?
- On the last Sunday in October, at 2:00 a.m. local time, all member zones exit daylight saving, reverting to their standard UTC+00:00 offset.
- Does the whole region switch to summer time together?
- Yes, all three zones switch to BST on the last Sunday in March and stay there until the last Sunday in October.
- Do the islands coordinate clock changes?
- Daylight saving transitions are synchronized on the last Sunday of March and October, as in the wider UK system.
- Is BST the same as UK British Summer Time?
- Functionally, yes—the Crown Dependencies adopt the same timetable as the UK, though they are not part of it politically.
- What abbreviation is used in email signatures?
- BST (British Summer Time), the same abbreviation used in the UK. In winter the islands use GMT.
Source: IANA tzdb2026d · Reviewed
Free · Developer API
This time zone, as JSON.
Its defining offset, DST status and member counts, from one endpoint.
Also in the API: time zones by coordinates, conversions that flag daylight saving gaps, and abbreviations decoded.
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