BST to IRKST Converter
IRKST is not used on this date.
This converter uses IRKT (UTC+8), as in Irkutsk.
Start by searching for a time zone, city, or town.
Add one or more places to compare local times, adjust the date, and share the result.
Quick answers
Selected conversion
1:00 pm13:00 BST (UTC+1), Oct 17, 2026 = 8:00 pm20:00 IRKT (UTC+8), Oct 17, 2026
BST is 7 hours behind IRKT.
BST and IRKST examples
These examples always use BST (UTC+1) and IRKST (UTC+9). They stay the same when you change the date or time above. The selected conversion may differ when daylight saving time applies.
BST is 8 hours behind IRKST.
How the time difference changes
For most of the year, BST is 7 hours behind IRKT. From Oct 25, 2026 to Mar 28, 2027, GMT is 8 hours behind IRKT.
For most of the year, working hours of 9:00 am to 6:00 pm in BST correspond to 4:00 pm to 1:00 am (next day) in IRKT. At other times of the year, working hours of 9:00 am to 6:00 pm in GMT correspond to 5:00 pm to 2:00 am (next day) in IRKT.For most of the year, working hours of 09:00 to 18:00 in BST correspond to 16:00 to 01:00 (next day) in IRKT. At other times of the year, working hours of 09:00 to 18:00 in GMT correspond to 17:00 to 02:00 (next day) in IRKT.
Compare BST time with IRKST time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
British Summer Time is 7 hours behind Irkutsk Time.
1:00 pm13:00 in BST is 8:00 pm20:00 in IRKT
BST to IRKT call time
Best time for a conference call or a meeting is between 9am-11am09:00-11:00 in BST which corresponds to 4pm-6pm16:00-18:00 in IRKT
1:00 pm13:00 British Summer Time (BST). Offset UTC +1:00 hour
8:00 pm20:00 Irkutsk Time (IRKT). Offset UTC +8:00 hours
1:00 pm13:00 BST / 8:00 pm20:00 IRKT
Choose an hour to update the converter. Day labels such as “next day” or “+1” are relative to the selected date in the first column. Use Up and Down arrow keys, Home or End to move between hours, then Enter or Space to select.
| BST | IRKT |
|---|---|
| 7:00am | |
| 8:00am | |
| 9:00am | |
| 10:00am | |
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| 6:00pm | |
| 7:00pm | |
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| 12:00am next day | |
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| 07:00 | |
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| 00:00 next day | |
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| 06:00 next day |
British Summer Time
Offset: BST is 1 hour ahead of Greenwich Mean Time (GMT).
Countries using this time zone: Guernsey, Isle of Man, Jersey, United Kingdom
Principal Cities: The largest city in the BST time zone is London in the United Kingdom, with about 8.962 million people. Other major cities in this time zone include Birmingham, Glasgow, Manchester, Sheffield.
Current time in the United Kingdom: UK time now
Today all shaded areas are on BST.
Daylight Saving: British Summer Time (BST) is a daylight saving/summer time zone. During winter, some places set clocks back one hour and observe Greenwich Mean Time (GMT).
Start: British Summer Time (BST) started on Sunday, March 29, 2026 at 1:00 am01:00 local time and clocks were set one hour forward to Sunday, March 29, 2026, 2:00 am02:00. Daylight saving starts annually on the last Sunday of March.
End: British Summer Time (BST) ends on Sunday, October 25, 2026 at 2:00 am02:00 local time and clocks are set one hour back to Sunday, October 25, 2026, 1:00 am01:00 local standard time instead. Daylight saving ends annually on the last Sunday of October.
See United Kingdom daylight saving time and upcoming clock changes worldwide.
BST representations, usage and related time zones
- +01 - basic short
- +0100 - basic
- +01:00 - extended
- +0100 - sign character (+) followed by a four digit time providing hours (01) and minutes (00) of the offset. Indicates an offset of one hour to the east of the zero meridian.
- Alpha - Military abbreviation for BST
- A - short form of 'Alpha'
- Europe/Belfast
- Europe/Guernsey
- Europe/Isle_of_Man
- Europe/Jersey
- Europe/London
- GB
- GB-Eire
- British Summer Time - UTC +1
- Bangladesh Standard Time - UTC +6
- Bougainville Standard Time - UTC +11
- BST - British Summer Time
- CET - Central European Time
- IST - Irish Standard Time
- WEST - Western European Summer Time
- A - Alpha Time Zone
- CET - Central European Time
- MEZ - Mitteleuropäische Zeit
- WAT - West Africa Time
- WST - Western Sahara Summer Time
- BMT - Biel Mean Time
Irkutsk Summer Time
Offset: IRKST is 9 hours ahead of Greenwich Mean Time (GMT).
IRKST representations, usage and related time zones
- +09 - basic short
- +0900 - basic
- +09:00 - extended
- +0900 - sign character (+) followed by a four digit time providing hours (09) and minutes (00) of the offset. Indicates an offset of nine hours to the east of the zero meridian.
- India - Military abbreviation for IRKST
- I - short form of 'India'
- AWDT - Australian Western Daylight Time
- CHOST - Choibalsan Summer Time
- I - India Time Zone
- IRKST - Irkutsk Summer Time
- JST - Japan Standard Time
- KST - Korea Standard Time
- PWT - Palau Time
- TLT - East Timor Time
- ULAST - Ulaanbaatar Summer Time
- WIT - Eastern Indonesian Time
- YAKT - Yakutsk Time