UK Time is 4 hours 30 minutes behind India Standard 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 IST = 7:30 AM BST at the moment. (UK Time is on BST for daylight saving time right now.)
IST to GMT conversion table
| IST | BST when IST is IST | GMT when IST is IST |
|---|---|---|
| 12:00 AM | 7:30 PM −1 day | 6:30 PM −1 day |
| 1:00 AM | 8:30 PM −1 day | 7:30 PM −1 day |
| 2:00 AM | 9:30 PM −1 day | 8:30 PM −1 day |
| 3:00 AM | 10:30 PM −1 day | 9:30 PM −1 day |
| 4:00 AM | 11:30 PM −1 day | 10:30 PM −1 day |
| 5:00 AM | 12:30 AM | 11:30 PM −1 day |
| 6:00 AM | 1:30 AM | 12:30 AM |
| 7:00 AM | 2:30 AM | 1:30 AM |
| 8:00 AM | 3:30 AM | 2:30 AM |
| 9:00 AM | 4:30 AM | 3:30 AM |
| 10:00 AM | 5:30 AM | 4:30 AM |
| 11:00 AM | 6:30 AM | 5:30 AM |
| 12:00 PM | 7:30 AM | 6:30 AM |
| 1:00 PM | 8:30 AM | 7:30 AM |
| 2:00 PM | 9:30 AM | 8:30 AM |
| 3:00 PM | 10:30 AM | 9:30 AM |
| 4:00 PM | 11:30 AM | 10:30 AM |
| 5:00 PM | 12:30 PM | 11:30 AM |
| 6:00 PM | 1:30 PM | 12:30 PM |
| 7:00 PM | 2:30 PM | 1:30 PM |
| 8:00 PM | 3:30 PM | 2:30 PM |
| 9:00 PM | 4:30 PM | 3:30 PM |
| 10:00 PM | 5:30 PM | 4:30 PM |
| 11:00 PM | 6:30 PM | 5:30 PM |
IST and GMT difference through 2027
The gap between the two zones on each date range, including daylight saving time changes:
| Dates | India Standard Time | UK Time | Difference |
|---|---|---|---|
| Sep 30, 2026 – Oct 24, 2026 | IST (UTC+5:30) | BST (UTC+1) | GMT 4 hours 30 minutes behind |
| Oct 25, 2026 – Mar 27, 2027 | IST (UTC+5:30) | GMT (UTC+0) | GMT 5 hours 30 minutes behind |
| Mar 28, 2027 – Oct 30, 2027 | IST (UTC+5:30) | BST (UTC+1) | GMT 4 hours 30 minutes behind |
| Oct 31, 2027 – Dec 31, 2027 | IST (UTC+5:30) | GMT (UTC+0) | GMT 5 hours 30 minutes behind |
Best time to meet or call
- When GMT is 4 hours 30 minutes behind IST: Working hours (9 AM–5 PM) overlap from 1:30 PM–5:00 PM IST (9:00 AM–12:30 PM GMT), about 3 hours 30 minutes.
- When GMT is 5 hours 30 minutes behind IST: Working hours (9 AM–5 PM) overlap from 2:30 PM–5:00 PM IST (9:00 AM–11:30 AM GMT), about 2 hours 30 minutes.
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.
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.
Frequently asked questions
What time is 12 PM IST in GMT?
12:00 PM IST is 7:30 AM BST 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 GMT from IST?
Currently 4 hours 30 minutes behind IST. During the year the difference is 4 hours 30 minutes behind IST or 5 hours 30 minutes behind IST, depending on daylight saving time. See the table on this page for exact dates.
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.
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.
What is the best time for a call between IST and GMT?
Right now, working hours overlap from 1:30 PM–5:00 PM IST (9:00 AM–12:30 PM GMT), about 3 hours 30 minutes.
More time zone conversions
- GMT to IST (reverse)
- IST to EST
- IST to PST
- IST to CST
- IST to UTC
- EST to GMT
- PST to GMT
- IST to GST
- 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.