Time zone · Europe
AZOST
Azores Summer Time
Azores Summer Time (AZOST) is more than just a quirk of the calendar—it puts the Azores islands in sync with Western Europe during the warmest months, making business hours with Lisbon or London feel almost seamless. If you’ve ever dreamed of coordinating across the Atlantic islands without the mental gymnastics of clocks jumping backward, this is the season that feels most connected to the mainland.
Friday, June 5, 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 more than just a quirk of the calendar—it puts the Azores islands in sync with Western Europe during the warmest months, making business hours with Lisbon or London feel almost seamless. If you’ve ever dreamed of coordinating across the Atlantic islands without the mental gymnastics of clocks jumping backward, this is the season that feels most connected to the mainland.
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.
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?
- The current summer offset expires after 2026-10-25 00:00:00+00. Clocks move back an hour, returning the Azores to their standard UTC -01:00 zone until the next spring shift.
- 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?
- During the summer, the Azores align with Brussels, Warsaw, and Paris, making conference calls remarkably intuitive. In winter, the islands drift an hour earlier than most of Europe.
- 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.”
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