IST to GMT Converter
Convert India Standard Time (IST, UTC+5:30) to UK time (GMT/BST). This page uses Mumbai time and London time, so it follows daylight saving automatically: pick any date below and the conversion uses the offsets in force on that day.
IST to GMT time difference
The converter above shows the difference for the date and time you choose. Over 2026, the gap works out like this:
- GMT is 4 hours 30 minutes behind ISTMost of the year: Mar 29 to Oct 24.
- GMT is 5 hours 30 minutes behind ISTJan 1 to Mar 28, Oct 25 to Dec 31.
IST to GMT for a working day
Mumbai time from 6 AM to 10 PM, converted. The two columns differ because daylight saving changes the gap between winter and summer. Bold times fall between 9 AM and 5 PM in GMT.
| IST (Mumbai) | GMT (London), January | GMT (London), July |
|---|---|---|
| 6:00 AM | 12:30 AM | 1:30 AM |
| 7:00 AM | 1:30 AM | 2:30 AM |
| 8:00 AM | 2:30 AM | 3:30 AM |
| 9:00 AM | 3:30 AM | 4:30 AM |
| 10:00 AM | 4:30 AM | 5:30 AM |
| 11:00 AM | 5:30 AM | 6:30 AM |
| 12:00 PM | 6:30 AM | 7:30 AM |
| 1:00 PM | 7:30 AM | 8:30 AM |
| 2:00 PM | 8:30 AM | 9:30 AM |
| 3:00 PM | 9:30 AM | 10:30 AM |
| 4:00 PM | 10:30 AM | 11:30 AM |
| 5:00 PM | 11:30 AM | 12:30 PM |
| 6:00 PM | 12:30 PM | 1:30 PM |
| 7:00 PM | 1:30 PM | 2:30 PM |
| 8:00 PM | 2:30 PM | 3:30 PM |
| 9:00 PM | 3:30 PM | 4:30 PM |
| 10:00 PM | 4:30 PM | 5:30 PM |
Calculated for January 15 and July 15, 2026.
About these time zones
IST. India Standard Time is UTC+5:30 all year with no daylight saving, and covers the whole country. The half-hour offset means India-facing meetings often start on the half hour.
GMT. This page uses London time, which is GMT (UTC+0) in winter and BST (UTC+1) from the last Sunday in March to the last Sunday in October. If you need fixed GMT all year, use the UTC pages instead.
Overlap. Meetings starting between 3:00 PM and 4:00 PM IST land inside a 9 to 5 working day in both zones in winter and summer.