Time zone · Europe
IST
Irkutsk Standard Time
Irkutsk Standard Time (IST) keeps things straightforward with a steady UTC+08:00 offset all year round, no daylight saving changes—just one consistent time across the Irkutsk region of Russia. It’s a reliable clock for coordinating in Siberia, where the timezone has held steady since 2014.
Thursday, October 15, 2026
Current offset
UTC+08:00
Standard · +08
Daylight saving
Not observed
Year-round standard time
IANA zones
1
None observe daylight saving
DST offset
—
No summer variant
About IST
A fixed, year-round offset.
Irkutsk Standard Time (IST) keeps things straightforward with a steady UTC+08:00 offset all year round, no daylight saving changes—just one consistent time across the Irkutsk region of Russia. It’s a reliable clock for coordinating in Siberia, where the timezone has held steady since 2014.
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 across IST
Local time, city by city.
1 city
Where IST is used
One country.
Same offset · UTC+08:00
Other zones at UTC+08:00 right now.
These named zones share IST's offset today. When daylight saving rules differ, they drift apart for part of the year.
Convert
IST to the world's clocks.
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].
- Does Irkutsk Time ever observe daylight saving time?
- No—Irkutsk Standard Time stays at UTC+08:00 year-round with no daylight saving transitions.
- When was the current offset adopted?
- Irkutsk has been on UTC+08:00 since October 26, 2014, when Russia moved most regions back one hour. Seasonal clock changes had already ended in 2011.
- Is Irkutsk the only zone using this time?
- Yes—Irkutsk is the only zone in this time zone group, covering the Irkutsk Oblast part of Russia.
- How many countries use Irkutsk Time?
- Only Russia uses Irkutsk Standard Time; there are no other countries in this region.
- What happens if you need to schedule with Europe or the US?
- Irkutsk stays on UTC+08:00 all year, but the gap to Europe and the Americas still changes by an hour when those places start or end daylight saving time.
- Why doesn’t this timezone change its clocks?
- Russia abolished seasonal clock changes in 2011, leaving Irkutsk on permanent summer time (UTC+09:00). In October 2014 Russia moved most regions back one hour, which put Irkutsk permanently on UTC+08:00.
- Will there ever be a future transition?
- There are no scheduled or expected future transitions; the region doesn’t observe DST and has no announced plans to change offset.
Source: IANA tzdb2026d · Reviewed
Free · Developer API
This time zone, as JSON.
Its defining offset, DST status and member counts, from one endpoint.
Also in the API: time zones by coordinates, conversions that flag daylight saving gaps, and abbreviations decoded.
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