GMT to IST
On Oct 23, 2026, India Standard Time is 4 hours 30 minutes ahead of UK time: 9:00 AM BST is 1:30 PM IST. The gap changes during the year because of daylight saving time; the dates are below.
IST vs GMT over the next 12 months
| Period | IST is | Example |
|---|---|---|
| Oct 23, 2026 to Oct 25, 2026 | 4 hours 30 minutes ahead | 9:00 AM BST = 1:30 PM IST |
| Oct 25, 2026 to Mar 28, 2027 | 5 hours 30 minutes ahead | 9:00 AM GMT = 2:30 PM IST |
| Mar 28, 2027 onwards | 4 hours 30 minutes ahead | 9:00 AM BST = 1:30 PM IST |
GMT to IST conversion table
Every hour of a weekday around Oct 23, 2026, in both zones.
| UK time | India Standard Time |
|---|---|
| 12:00 AM | 5:30 AM |
| 1:00 AM | 6:30 AM |
| 2:00 AM | 7:30 AM |
| 3:00 AM | 8:30 AM |
| 4:00 AM | 9:30 AM |
| 5:00 AM | 10:30 AM |
| 6:00 AM | 11:30 AM |
| 7:00 AM | 12:30 PM |
| 8:00 AM | 1:30 PM |
| 9:00 AM | 2:30 PM |
| 10:00 AM | 3:30 PM |
| 11:00 AM | 4:30 PM |
| 12:00 PM | 5:30 PM |
| 1:00 PM | 6:30 PM |
| 2:00 PM | 7:30 PM |
| 3:00 PM | 8:30 PM |
| 4:00 PM | 9:30 PM |
| 5:00 PM | 10:30 PM |
| 6:00 PM | 11:30 PM |
| 7:00 PM | 12:30 AM (next day) |
| 8:00 PM | 1:30 AM (next day) |
| 9:00 PM | 2:30 AM (next day) |
| 10:00 PM | 3:30 AM (next day) |
| 11:00 PM | 4:30 AM (next day) |
Best time for a meeting
Normal 9-to-5 working hours overlap for 2 hours 30 minutes on a weekday: 9:00 AM–11:30 AM GMT, which is 2:30 PM–5:00 PM IST.
Comparing more than two places? The meeting planner lines up working hours for up to six cities.
Daylight saving time
UK time (GMT/BST)
- Oct 25, 2026: clocks go back 1 hour at 2:00 AM (UTC+1 → UTC±0)
- Mar 28, 2027: clocks go forward 1 hour at 1:00 AM (UTC±0 → UTC+1)
Where these clocks are used
- UK time (GMT/BST): London, Edinburgh, Dublin and Lisbon keep the same clock. IANA zone
Europe/London. - India Standard Time (IST): all of India: Mumbai, Delhi, Bengaluru, Chennai. IANA zone
Asia/Kolkata.
Questions
What time is it in IST when it is 9 AM GMT?
On Oct 23, 2026, 9:00 AM BST is 1:30 PM IST. On other dates the answer can shift by an hour because of daylight saving time; the table of periods on this page gives each one.
How many hours ahead of GMT is IST?
It depends on the date. Oct 23, 2026 to Oct 25, 2026: IST is 4 hours 30 minutes ahead. Oct 25, 2026 to Mar 28, 2027: IST is 5 hours 30 minutes ahead. Mar 28, 2027 onwards: IST is 4 hours 30 minutes ahead.
Do GMT and IST observe daylight saving time?
UK time switches to BST (UTC+1) in summer and back to GMT (UTC±0) in winter. India Standard Time stays on UTC+5:30 all year.
What is the best time for a meeting between GMT and IST?
Normal 9-to-5 working hours overlap for 2 hours 30 minutes on a weekday: 9:00 AM–11:30 AM GMT, which is 2:30 PM–5:00 PM IST.
Scheduling across time zones? Share one Caly booking link and every guest sees your free times in their own zone. Try Caly free
Related conversions
- IST to GMT (reverse)
- EST to IST
- CST to IST
- MST to IST
- PST to IST
- UTC to IST
- GMT to EST
- GMT to CST
- GMT to MST
- GMT to PST
- GMT to UTC
- GMT to CET
- All time zones
Computed from the IANA time zone database on Oct 23, 2026. Live clocks and the converter use your browser's copy of the same data.