Time zone · Europe
AZOST
Azores Summer Time
Azores Summer Time (AZOST) is the daylight-saving clock used across the Atlantic/Azores territory in Portugal, where clocks sit at UTC+00:00 while summer time is active. Living or working in this region means shifting forward by one hour from the standard UTC-01:00 base during the warmer months, aligning daily life with longer European evenings and a brief seasonal step ahead of mainland Portugal.
Sunday, May 31, 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 the daylight-saving clock used across the Atlantic/Azores territory in Portugal, where clocks sit at UTC+00:00 while summer time is active. Living or working in this region means shifting forward by one hour from the standard UTC-01:00 base during the warmer months, aligning daily life with longer European evenings and a brief seasonal step ahead of mainland Portugal.
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].
- What time zone is the Azores in during summer?
- During summer, the Azores observes Azores Summer Time (AZOST), which sets the clock to UTC+00:00, matching Western European Summer Time and moving one hour ahead of the standard Azores time.
- How does AZOST compare to mainland Portugal's time in summer?
- In summer, AZOST matches mainland Portugal's Western European Summer Time (WEST), both at UTC+00:00, while the rest of the year, the Azores stays one hour behind mainland Portugal.
- When do the Azores set their clocks forward?
- Clocks in the Azores move forward by one hour at 01:00 local time on the last Sunday in March, aligning with the start of AZOST, and move back on the last Sunday in October.
- What does AZOST stand for?
- AZOST stands for Azores Summer Time, the daylight saving time used in the Azores during the summer months, setting the clock to UTC+00:00.
- Is the Azores on the same as Greenwich Mean Time in summer?
- Yes, during summer, the Azores matches Greenwich Mean Time (GMT), both at UTC+00:00, due to AZOST, though it is geographically further west than the UK.
- What happens to the time in the Azores in October?
- On the last Sunday in October, clocks in the Azores move back by one hour, ending AZOST and returning to standard Azores Standard Time (AZOT) at UTC-01:00.
- What is the time difference between the Azores and most of Europe in summer?
- During AZOST, the Azores aligns with Western European Summer Time, which is the same as UTC+00:00, making it one hour ahead of regions still in standard time, but the same as the UK and Ireland in summer.
- Is the Azores the only place that uses AZOST?
- AZOST is used only in the Azores, a Portuguese archipelago in the Atlantic Ocean, making it unique to this region.
- What is the purpose of daylight saving in the Azores?
- Daylight saving in the Azores aligns daily life with seasonal daylight, bringing an extra hour of evening light and synchronizing with mainland Europe during summer months.
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