Time zone · Europe
IST
Irish Standard Time
Irish Standard Time (IST) follows Dublin's clock, cycling between Greenwich Mean Time in winter and UTC+01:00 in the lighter months to make the most of Ireland's long summer evenings.
Sunday, May 31, 2026
Current offset
UTC+01:00
Daylight · IST
Daylight saving
Active
Reverts 25 Oct 2026
IANA zones
1
1 observe DST, 0 don't
DST offset
—
No summer variant
About IST
Standard time, with a summer shift.
Irish Standard Time (IST) follows Dublin's clock, cycling between Greenwich Mean Time in winter and UTC+01:00 in the lighter months to make the most of Ireland's long summer evenings.
IANA zones · the technical identifiers
The zone that resolve to IST.
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 IST
The same hour, city by city.
1 city · all UTC+01:00
Where IST is used
One country.
Same offset · UTC+01:00
Other zones at UTC+01:00 right now.
These named zones share IST's offset today. When daylight saving rules differ, they drift apart for part of the year.
Frequently asked questions
Common questions about IST, daylight saving, and how to handle it in software. Can't find what you need? Email [email protected].
- Is Irish Standard Time the same as India Standard Time?
- They share the IST abbreviation, but Ireland's IST is distinct and specific to the Republic of Ireland's daylight-saving arrangement.
- Why does Ireland use a different time zone during summer?
- Clocks move forward in late March to shift more daylight into the evening hours, which improves commuting safety, supports tourism, and reduces energy use in milder seasons.
- When do clocks change in IST?
- Europe/Dublin typically moves forward in late March and falls back at the end of October, aligning broadly with EU practice for daylight-saving transitions.
- Does Irish Standard Time differ from UK time?
- Ireland and the UK often show the same clock reading, but Ireland labels the summer period IST rather than British Summer Time (BST).
- Is IST used as the legal time throughout all of Ireland?
- Yes. IST, via the Europe/Dublin zone, is the standard legal time across the entire Republic of Ireland.
- What does IST look like in daily business?
- Most Irish businesses, schools, and public services follow the IST schedule, offering largely predictable coordination with European partners around the daylight-saving shift.
Free · Developer API
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