Time zone · Europe
AZOST
Azores Summer Time
Azores Summer Time (AZOST) is UTC+00:00, the daylight saving time the Azores use from the last Sunday in March to the last Sunday in October. The islands stay one hour behind Lisbon and London all year, because mainland Portugal and the UK change clocks on the same dates.
Wednesday, October 14, 2026
Current offset
UTC+00:00
Daylight · +00
Daylight saving
Active
Reverts 25 Oct 2026
IANA zones
1
1 observe DST, 0 don't
DST offset
—
No summer variant
About AZOST
Standard time, with a summer shift.
Azores Summer Time (AZOST) is UTC+00:00, the daylight saving time the Azores use from the last Sunday in March to the last Sunday in October. The islands stay one hour behind Lisbon and London all year, because mainland Portugal and the UK change clocks on the same dates.
IANA zones · the technical identifiers
The zone that resolve to AZOST.
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.
Where AZOST is used
One country.
Same offset · UTC+00:00
Other zones at UTC+00:00 right now.
These named zones share AZOST's offset today. When daylight saving rules differ, they drift apart for part of the year.
Convert
AZOST to the world's clocks.
Frequently asked questions
Common questions about AZOST, daylight saving, and how to handle it in software. Can't find what you need? Email [email protected].
- Does the Azores observe daylight saving time?
- Yes. All zones that use AZOST shift forward by one hour in summer, typically between late March and late October, matching the EU’s seasonal clock changes for mainland Portugal.
- When does Azores Summer Time end?
- Azores Summer Time ends on the last Sunday in October, when clocks move back an hour and return the Azores to their standard UTC-01:00 until the last Sunday in March.
- Which country uses Azores Summer Time?
- Portugal fully adopts AZOST through its Atlantic island territories in the Azores, though most mainland Portugal uses Western European Time/Western European Summer Time.
- Is AZOST used outside Portugal?
- No. The code is specific to Portuguese law. Other regions that fall within similar longitudes—such as Iceland or the UK—remain on their own time frameworks.
- Why does AZOST matter for global collaboration?
- The Azores are always one hour behind Lisbon and London and two hours behind Paris, Brussels and Warsaw, because they change clocks at the same moment as the rest of the EU.
- What is the official abbreviation for Azores Summer Time?
- You’ll see “+00” in technical logs, but locals rarely call it anything other than “Azores Summer Time.”
Source: IANA tzdb2026d · Reviewed
Free · Developer API
This time zone, as JSON.
Its defining offset, DST status and member counts, from one endpoint.
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