Convert India Standard Time to Greenwich Mean Time - Quick & Accurate
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Hover over any hour to see corresponding time in both zones
To schedule a meeting between IST and GMT:
Pro Tip: Schedule calls during the overlap window for optimal convenience for both time zones
| IST Time | GMT Time | Context |
|---|---|---|
| 12:00 AM | 06:30 PM | Midnight IST |
| 01:00 AM | 07:30 PM | Late Night |
| 02:00 AM | 08:30 PM | Late Night |
| 03:00 AM | 09:30 PM | Late Night |
| 04:00 AM | 10:30 PM | Late Night |
| 05:00 AM | 11:30 PM | Late Night |
| 06:00 AM | 12:30 AM | Early Morning IST |
| 07:00 AM | 01:30 AM | Night Time |
| 08:00 AM | 02:30 AM | Night Time |
| 09:00 AM | 03:30 AM | Work Starts IST |
| 10:00 AM | 04:30 AM | Night Time |
| 11:00 AM | 05:30 AM | Night Time |
Mumbai
Asia/Kolkata
London
Europe/London
GMT (Greenwich Mean Time) is 5.5 hours behind IST (India Standard Time). This means when it's 12:00 PM in Mumbai (IST), it's 6:30 AM in London (GMT).
The best time to call from IST to GMT is during overlapping business hours. For IST callers, schedule between 12:00 PM - 5:00 PM IST to ensure both parties are within standard business hours.
The time difference may change during daylight saving transitions if one region observes DST while the other doesn't. India Standard Time (UTC+5:30) and Greenwich Mean Time (UTC+0 (GMT) / UTC+1 (BST)) may have different DST schedules.
IST includes cities like Mumbai. GMT includes cities like London. Both time zones cover important business and cultural centers.
In 2025, DST in North America starts on March 9 at 2:00 AM and ends on November 2 at 2:00 AM. Other regions may have different DST schedules or not observe DST at all.