India Standard Time is 4 hours 30 minutes ahead of UK Time right now (until Oct 24, 2026); the gap changes to 5 hours 30 minutes when clocks change for daylight saving time. So 12:00 PM BST = 4:30 PM IST at the moment. (UK Time is on BST for daylight saving time right now.)
GMT to IST conversion table
| GMT | IST when GMT is BST | IST when GMT is GMT |
|---|---|---|
| 12:00 AM | 4:30 AM | 5:30 AM |
| 1:00 AM | 5:30 AM | 6:30 AM |
| 2:00 AM | 6:30 AM | 7:30 AM |
| 3:00 AM | 7:30 AM | 8:30 AM |
| 4:00 AM | 8:30 AM | 9:30 AM |
| 5:00 AM | 9:30 AM | 10:30 AM |
| 6:00 AM | 10:30 AM | 11:30 AM |
| 7:00 AM | 11:30 AM | 12:30 PM |
| 8:00 AM | 12:30 PM | 1:30 PM |
| 9:00 AM | 1:30 PM | 2:30 PM |
| 10:00 AM | 2:30 PM | 3:30 PM |
| 11:00 AM | 3:30 PM | 4:30 PM |
| 12:00 PM | 4:30 PM | 5:30 PM |
| 1:00 PM | 5:30 PM | 6:30 PM |
| 2:00 PM | 6:30 PM | 7:30 PM |
| 3:00 PM | 7:30 PM | 8:30 PM |
| 4:00 PM | 8:30 PM | 9:30 PM |
| 5:00 PM | 9:30 PM | 10:30 PM |
| 6:00 PM | 10:30 PM | 11:30 PM |
| 7:00 PM | 11:30 PM | 12:30 AM +1 day |
| 8:00 PM | 12:30 AM +1 day | 1:30 AM +1 day |
| 9:00 PM | 1:30 AM +1 day | 2:30 AM +1 day |
| 10:00 PM | 2:30 AM +1 day | 3:30 AM +1 day |
| 11:00 PM | 3:30 AM +1 day | 4:30 AM +1 day |
GMT and IST difference through 2027
The gap between the two zones on each date range, including daylight saving time changes:
| Dates | UK Time | India Standard Time | Difference |
|---|---|---|---|
| Sep 30, 2026 – Oct 24, 2026 | BST (UTC+1) | IST (UTC+5:30) | IST 4 hours 30 minutes ahead |
| Oct 25, 2026 – Mar 27, 2027 | GMT (UTC+0) | IST (UTC+5:30) | IST 5 hours 30 minutes ahead |
| Mar 28, 2027 – Oct 30, 2027 | BST (UTC+1) | IST (UTC+5:30) | IST 4 hours 30 minutes ahead |
| Oct 31, 2027 – Dec 31, 2027 | GMT (UTC+0) | IST (UTC+5:30) | IST 5 hours 30 minutes ahead |
Best time to meet or call
- When IST is 4 hours 30 minutes ahead of GMT: Working hours (9 AM–5 PM) overlap from 9:00 AM–12:30 PM GMT (1:30 PM–5:00 PM IST), about 3 hours 30 minutes.
- When IST is 5 hours 30 minutes ahead of GMT: Working hours (9 AM–5 PM) overlap from 9:00 AM–11:30 AM GMT (2:30 PM–5:00 PM IST), about 2 hours 30 minutes.
About UK Time (GMT)
The UK uses GMT (UTC+0) in winter and British Summer Time, BST (UTC+1), from the last Sunday in March to the last Sunday in October. It's used in London, Manchester, Birmingham, Edinburgh, Cardiff and Belfast.
About India Standard Time (IST)
India uses one time zone, IST (UTC+5:30), all year. India does not observe daylight saving time, so its difference from the US and UK changes when they change their clocks. It's used in all of India, including New Delhi, Mumbai, Bengaluru, Hyderabad, Chennai and Kolkata.
Frequently asked questions
What time is 12 PM GMT in IST?
12:00 PM BST is 4:30 PM IST right now (Sep 30, 2026 to Oct 24, 2026). The answer changes when either zone changes its clocks for daylight saving time.
How many hours ahead or behind is IST from GMT?
Currently 4 hours 30 minutes ahead of GMT. During the year the difference is 4 hours 30 minutes ahead of GMT or 5 hours 30 minutes ahead of GMT, depending on daylight saving time. See the table on this page for exact dates.
Does GMT change for daylight saving time?
Yes. The UK uses GMT (UTC+0) in winter and British Summer Time, BST (UTC+1), from the last Sunday in March to the last Sunday in October.
Does IST change for daylight saving time?
No. India uses one time zone, IST (UTC+5:30), all year. India does not observe daylight saving time, so its difference from the US and UK changes when they change their clocks.
What is the best time for a call between GMT and IST?
Right now, working hours overlap from 9:00 AM–12:30 PM GMT (1:30 PM–5:00 PM IST), about 3 hours 30 minutes.
More time zone conversions
- IST to GMT (reverse)
- EST to IST
- PST to IST
- CST to IST
- UTC to IST
- GMT to EST
- GMT to PST
- GST to IST
- All time zones
Sources
Reviewed by Gurmej Singh, Founder, Divy Digital Hub · Last reviewed: Wednesday, September 30, 2026. All calculations run in your browser. Editorial policy.