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.
Saturday, June 6, 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 currently on IST
The same hour, city by city.
1 city · all UTC+08:00
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.
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?
- Russia has kept Irkutsk at UTC+08:00 since October 26, 2014, when several Siberian regions stopped seasonal clock shifts.
- Is Irkutsk the only zone using this time?
- Yes—Asia/Irkutsk is the sole member zone in this region, 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?
- Because it’s fixed at +08:00 and doesn’t observe DST, you can calculate offsets with the Americas and Europe without worrying mid-year changes.
- Why doesn’t this timezone change its clocks?
- Russia abolished several seasonal clock shifts in 2014 to simplify scheduling across its many time zones; Irkutsk moved permanently to +08:00 as part of that reform.
- What’s special about this region’s number of member zones?
- Irkutsk Standard Time is one of the smallest region codes—just a single zone representing a single part of Russia.
- 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.
Free · Developer API
Time, as JSON.
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