Highlighted rows fall within 09:00–18:00 in both places: 4 shared working hours.
Clock changes in IST and London
IST
India Standard Time (IST)
No daylight saving time.
London
British Summer Time (BST)
Next clock change Sun 25 Oct 2026 (UTC+1 → UTC+0)
Time difference between IST and London today
At this moment London is 4.5 hours behind of IST. When it is 09:00 in IST, it is 04:30 in London. IST is on India Standard Time (IST); London is on British Summer Time (BST).
When the IST to London time difference changes
For most of the year London is 4.5 hours behind of IST. From 25 October to 31 December 2026, London is 5.5 hours behind of IST instead, because the two places change their clocks on different dates. Meetings booked by the usual gap land an hour off in those weeks.
Dates
London vs IST
Length
29 March 2026 to 24 October 2026
4.5 hours behind
210 days
25 October 2026 to 31 December 2026
5.5 hours behind
68 days
1 January 2027 to 27 March 2027
5.5 hours behind
86 days
28 March 2027 to 30 October 2027
4.5 hours behind
217 days
31 October 2027 to 31 December 2027
5.5 hours behind
62 days
Best time for a meeting between IST and London
When London is 4.5 hours behind of IST: 3 shared office hours, 14:00 to 17:00 in IST (09:30 to 12:30 in London).
When London is 5.5 hours behind of IST: 2 shared office hours, 15:00 to 17:00 in IST (09:30 to 11:30 in London).
Frequently asked questions about IST and London time
What time is it in London when it is 9:00 AM in IST?
04:30 today; London is 4.5 hours behind of IST.
Does the time difference between IST and London change?
Yes. It is usually 4.5 hours behind, but changes when one side moves its clocks: 5.5 hours behind from 25 October to 31 December 2026; 5.5 hours behind from 1 January to 27 March 2027.