Time zone · Europe
BST
Guernsey Summer Time
Guernsey Summer Time covers the British Crown Dependencies—Guernsey, the Isle of Man, and Jersey—unifying them under the BST (UTC+01:00) during daylight saving. Living and collaborating here means enjoying one of the UK’s simplest, most predictable clock-shift rhythms, with all three islands perfectly in sync.
Sunday, May 31, 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 covers the British Crown Dependencies—Guernsey, the Isle of Man, and Jersey—unifying them under the BST (UTC+01:00) during daylight saving. Living and collaborating here means enjoying one of the UK’s simplest, most predictable clock-shift rhythms, with all three islands perfectly in sync.
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].
- Does BST in this region always match the UK’s Summer Time?
- Yes—these Crown Dependencies adopt the same DST transitions as the UK, so their clocks shift forward and back in lockstep, keeping them perfectly aligned year-round.
- Are all member zones identical in practice?
- Essentially, yes. Europe/Guernsey, Europe/Isle_of_Man, and Europe/Jersey all follow the exact same rules: standard time at UTC+00:00 and summer time at UTC+01:00, with identical transition dates.
- When do clocks change?
- Clocks spring forward on the last Sunday in March and fall back on the last Sunday in October—just like the UK—making it easy to plan travel, broadcasts, and virtual meetings without surprises.
- Why do these islands share the same time zone?
- As British Crown Dependencies, their timekeeping aligns with UK conventions for consistency in commerce, transport, and government, simplifying coordination across the islands and with the mainland.
- Is daylight saving fully observed everywhere in the region?
- Yes—all three zones observe DST with no exceptions, so every part of the region changes clocks on the same dates and times.
- What’s the practical effect of using BST instead of GMT?
- BST shifts local time one hour ahead of UTC, giving evenings more natural light in summer, which helps align daily life and business hours with the rest of the UK.
Free · Developer API
Time, as JSON.
Every IANA time zone with live offsets, DST status, and the countries and cities that use them — clean, dependable JSON. Sign up free and get an API key in seconds.
countries, cities, convert, DST transitions coming next.
Get your free API key →