GMT to IST Converter
Convert UK time (GMT/BST) to India Standard Time (IST, UTC+5:30). This page uses London time and Mumbai time, so it follows daylight saving automatically: pick any date below and the conversion uses the offsets in force on that day.
GMT to IST time difference
The converter above shows the difference for the date and time you choose. Over 2026, the gap works out like this:
- IST is 4 hours 30 minutes ahead of GMTMost of the year: Mar 29 to Oct 24.
- IST is 5 hours 30 minutes ahead of GMTJan 1 to Mar 28, Oct 25 to Dec 31.
GMT to IST for a working day
London 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 IST.
| GMT (London) | IST (Mumbai), January | IST (Mumbai), July |
|---|---|---|
| 6:00 AM | 11:30 AM | 10:30 AM |
| 7:00 AM | 12:30 PM | 11:30 AM |
| 8:00 AM | 1:30 PM | 12:30 PM |
| 9:00 AM | 2:30 PM | 1:30 PM |
| 10:00 AM | 3:30 PM | 2:30 PM |
| 11:00 AM | 4:30 PM | 3:30 PM |
| 12:00 PM | 5:30 PM | 4:30 PM |
| 1:00 PM | 6:30 PM | 5:30 PM |
| 2:00 PM | 7:30 PM | 6:30 PM |
| 3:00 PM | 8:30 PM | 7:30 PM |
| 4:00 PM | 9:30 PM | 8:30 PM |
| 5:00 PM | 10:30 PM | 9:30 PM |
| 6:00 PM | 11:30 PM | 10:30 PM |
| 7:00 PM | 12:30 AM(next day) | 11:30 PM |
| 8:00 PM | 1:30 AM(next day) | 12:30 AM(next day) |
| 9:00 PM | 2:30 AM(next day) | 1:30 AM(next day) |
| 10:00 PM | 3:30 AM(next day) | 2:30 AM(next day) |
Calculated for January 15 and July 15, 2026.
About these time zones
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.
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.
Overlap. Meetings starting between 9:00 AM and 11:00 AM GMT land inside a 9 to 5 working day in both zones in winter and summer.