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 during summer months and shifting together through daylight saving so local routines—meetings, buses, and tides of island life—stay naturally aligned until clocks fall back each October.
Friday, June 5, 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 during summer months and shifting together through daylight saving so local routines—meetings, buses, and tides of island life—stay naturally aligned until clocks fall back each October.
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 currently on BST
The same hour, city by city.
3 cities · all UTC+01:00
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.
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 code names the region after Guernsey because it’s the representative zone; all three Crown Dependencies share identical daylight saving changes, but the naming follows timezone.io’s convention.
- How many places follow this region?
- Three Crown Dependencies—Guernsey, Jersey, and the Isle of Man—are member zones, each using Europe/* IANA identifiers.
- When does the current summer offset end?
- On 2026-10-25 at 01:00 local time, all member zones exit daylight saving, reverting to their standard UTC+00:00 offset.
- Is the whole region currently on summer time?
- Yes, all three zones have been on BST since late March 2026 and remain there until the October switch.
- 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?
- Despite being a Crown Dependency, BST is common, mirroring UK practice.
- Why are the zones listed as Europe/* IANA IDs?
- The IANA database groups them under the Europe directory, simplifying cross-referencing for software and calendar integrations.
Free · Developer API
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