GMT to IST Time Zone Converter
IST is currently 5 hours and 30 minutes ahead of GMT.
Convert a fixed abbreviation time
GMT to IST — Full 24-Hour Conversion Table
The table below shows what time it is in India Standard Time for every hour of the day in Greenwich Mean Time / British Summer Time, using the fixed UTC offsets named by these abbreviations. A city may use a different abbreviation during daylight saving time.
| Time in GMT (UTC+00:00) | Time in IST (UTC+05:30) |
|---|---|
| 00:00 | 05:30 |
| 01:00 | 06:30 |
| 02:00 | 07:30 |
| 03:00 | 08:30 |
| 04:00 | 09:30 |
| 05:00 | 10:30 |
| 06:00 | 11:30 |
| 07:00 | 12:30 |
| 08:00 | 13:30 |
| 09:00 | 14:30overlap |
| 10:00 | 15:30overlap |
| 11:00 | 16:30overlap |
| 12:00 | 17:30 |
| 13:00 | 18:30 |
| 14:00 | 19:30 |
| 15:00 | 20:30 |
| 16:00 | 21:30 |
| 17:00 | 22:30 |
| 18:00 | 23:30 |
| 19:00 | 00:30 |
| 20:00 | 01:30 |
| 21:00 | 02:30 |
| 22:00 | 03:30 |
| 23:00 | 04:30 |
Green rows indicate hours where both zones fall within 09:00–17:00 business hours. Abbreviations use their fixed UTC offsets. For a city that observes daylight saving, use the date-aware meeting planner.
Best Meeting Times: GMT and IST
The best meeting window is 09:00 AM–11:30 AM (London) / 02:30 PM–05:00 PM (Kolkata), giving 2 hours 30 min of shared business hours.
Shared business-hours overlap: 2 hours 30 min. Use our Meeting Planner to find specific slots and share with your team.
Working Across GMT and IST
Daylight Saving Time: GMT and IST
The UK observes BST (British Summer Time, UTC+1) from the last Sunday in March to the last Sunday in October. Outside those dates the zone is GMT (UTC+0).
India does not observe Daylight Saving Time. IST (UTC+5:30) is fixed year-round. India's unusual 30-minute offset was standardized in 1906 and applies to the entire country despite spanning nearly 30 degrees of longitude.