India Standard Time
IST means UTC+05:30 throughout the year.
Other meanings: Israel Standard Time · Irish Standard Time.
TIME ZONE CONVERTER
IST to BST
Time Converter
Convert India Standard Time to British Summer Time. Compare dates, seasonal differences and meeting hours.
IST is 4h 30m ahead of BST in 2026.
9 AM IST = 4:30 AM BST
Selected date: November 4, 2026. Fixed abbreviations retain their stated UTC offsets.
THE QUICK REFERENCE
CSVIST to BST conversion table
November 4, 2026 · Date changes are marked.
View the full 24-hour table
| IST | BST |
|---|---|
| 12:00 AM | 7:30 PM -1 day |
| 1:00 AM | 8:30 PM -1 day |
| 2:00 AM | 9:30 PM -1 day |
| 3:00 AM | 10:30 PM -1 day |
| 4:00 AM | 11:30 PM -1 day |
| 5:00 AM | 12:30 AM |
| 6:00 AM | 1:30 AM |
| 7:00 AM | 2:30 AM |
| 8:00 AM | 3:30 AM |
| 9:00 AM | 4:30 AM |
| 10:00 AM | 5:30 AM |
| 11:00 AM | 6:30 AM |
| IST | BST |
|---|---|
| 12:00 PM | 7:30 AM |
| 1:00 PM | 8:30 AM |
| 2:00 PM | 9:30 AM |
| 3:00 PM | 10:30 AM |
| 4:00 PM | 11:30 AM |
| 5:00 PM | 12:30 PM |
| 6:00 PM | 1:30 PM |
| 7:00 PM | 2:30 PM |
| 8:00 PM | 3:30 PM |
| 9:00 PM | 4:30 PM |
| 10:00 PM | 5:30 PM |
| 11:00 PM | 6:30 PM |
Starting with the BST working day
These examples start on 2026-11-04 in BST.
09:00 BST13:30 →IST · 2026-11-04
17:00 BST21:30 →IST · 2026-11-04
Which time-zone meaning are we using?
British Summer Time
BST means UTC+01:00 throughout the year. London follows regional clock rules and uses UTC on your selected date.
Use London for local civil time →Other meanings: Bangladesh Standard Time.
ONE CLOCK TIME. THE WHOLE YEAR.
Year CSV09:00 IST to BST throughout 2026
09:00 in IST converts to 04:30 in BST on every date in 2026. The destination has the same calendar date.
Every calendar date is included, not just workdays. Date ranges include both endpoints. Based on IANA 2026e; future rules may change.
DON’T LOSE A DAY
When does IST time become a different date in BST?
Your complete source day: 2026-11-04. Each range shows which destination date to use.
IST · 2026-11-0400:00–04:30UTC+05:30
BST · 2026-11-0319:30–24:00UTC+01:00 Previous day
IST · 2026-11-0404:30–24:00UTC+05:30
BST · 2026-11-0400:00–19:30UTC+01:00 Same date
Range starts are included; ends are excluded. 24:00 means midnight at the end of that date. Repeated hours appear separately with their UTC offsets. The strip is proportional to elapsed time.
THE BIGGER PICTURE
2026Some things stay in sync.
The difference between IST and BST stays the same throughout 2026.
JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC
−4h 30m
Neither selected clock changes its UTC offset during 2026.
CLOCK CHANGES
No upcoming clock adjustment
Both selected labels are fixed offsets, so seasonal clock changes do not alter this conversion.
PLAN BEYOND A SINGLE DAY
Daily CSVIST–BST working hours through 2026
Every date calculated with your working windows. 261 selected IST workdays; public holidays are not applied.
Least shared time3h 30m
Most common3h 30m
Most shared time3h 30m
Days without a 60-min slot0 / 261
A start time that survives the whole year.
Start a 60-minute meeting in IST 13:30–16:00.
These starts fit both working windows on every selected IST workday in 2026, using a 15-minute start grid. The end of each range is the last valid start.
IST: 09:00–17:00, Mon, Tue, Wed, Thu, Fri. BST: 09:00–17:00, Mon, Tue, Wed, Thu, Fri.
Calculation details and repeated hours
Overnight shifts belong to their start weekday. Host workday means the source calendar date. Repeated local times use the first occurrence.
THE DETAILS THAT MATTER
IST to BST: useful answers
Is BST the same as local city time?
BST is fixed at UTC+01:00. IST to London uses regional rules instead. On 2026-11-04, 09:00 at the source becomes 03:30 at the destination (GMT). Choose the local-city option above when that is the clock you mean.
Which cities match BST throughout 2026?
Lagos, Nigeria; Kinshasa, Congo - Kinshasa; Luanda, Angola; Abuja, Nigeria keep the same UTC+01:00 offset as fixed BST throughout 2026 under the published rules. Matching an offset does not mean every place uses the abbreviation BST.
Does the IST–BST time difference change in 2026?
The difference stays constant throughout 2026: BST is 4h 30m behind compared with IST.
Does this conversion change the calendar date?
09:00 in IST on 2026-11-04 is 04:30 in BST on 2026-11-04. This selected time stays on the same date in both places. Other times can cross midnight.
Can IST and BST meet during working hours?
Your selected working windows share 3h 30m on 2026-11-04. The planner above checks the whole meeting duration and shows suitable start times. Edit the windows to match your team.
Related time-zone meanings and conversions
Choose the question you need answered
Calculated with IANA 2026e. Working hours are your preferences; public holidays and calendar availability are not included. Our methodology