GMT to IST Converter – Convert GMT to Indian Time
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Complete GMT ↔ IST Conversion Table
All 24 hours · Both DST seasons · Best meeting windows marked ★
| GMT Time | IST Time UTC+0 → UTC+5:30 (+5h 30m, constant) |
|---|---|
| 12:00 AM (midnight) | 5:30 AM |
| 1:00 AM | 6:30 AM |
| 2:00 AM | 7:30 AM |
| 3:00 AM | 8:30 AM |
| 4:00 AM | 9:30 AM |
| 5:00 AM | 10:30 AM |
| 6:00 AM | 11:30 AM |
| 7:00 AM | 12:30 PM |
| 8:00 AM | 1:30 PM |
| ★ 9:00 AM | ★ 2:30 PM |
| ★ 10:00 AM | ★ 3:30 PM |
| ★ 11:00 AM | ★ 4:30 PM |
| 12:00 PM (noon) | 5:30 PM |
| 1:00 PM | 6:30 PM |
| 2:00 PM | 7:30 PM |
| 3:00 PM | 8:30 PM |
| 4:00 PM | 9:30 PM |
| 5:00 PM | 10:30 PM |
| 6:00 PM | 11:30 PM |
| 7:00 PM | +1 12:30 AM |
| 8:00 PM | +1 1:30 AM |
| 9:00 PM | +1 2:30 AM |
| 10:00 PM | +1 3:30 AM |
| 11:00 PM | +1 4:30 AM |
What is the time difference between GMT and IST?
IST is 5 hours 30 minutes ahead of GMT. When GMT switches to BST (late March to late October), the gap changes to 4 hours 30 minutes ahead of BST. 9:00 AM GMT = 2:30 PM IST. 12:00 PM GMT = 5:30 PM IST. 5:00 PM GMT = 10:30 PM IST.
What is the best time to call from London to Mumbai?
The business hours overlap between GMT and IST runs from 9:00 AM to 11:30 AM GMT (2:30 PM to 5:00 PM IST). Scheduling calls in this window keeps both sides within normal working hours.
Frequently Asked Questions about GMT and IST
IST is 5 hours 30 minutes ahead of GMT, so to convert mentally, add 5 hours 30 minutes to your GMT time. For example: 9:00 AM GMT = 2:30 PM IST. Our converter automatically adjusts for Daylight Saving Time so you always get the right result.
IST (India Standard Time, UTC+5:30) is 5 hours 30 minutes ahead of GMT (Greenwich Mean Time, UTC+0) during standard time. For example, 9:00 AM GMT = 2:30 PM IST. During DST periods, this difference changes by 1 hour when one or both zones observe Daylight Saving Time - our converter automatically applies the correct offset for any date you select.
The best overlap for standard business hours (9 AM–5 PM) in both zones is 09:00–11:30 GMT = 14:30–17:00 IST. Schedule recurring calls in this window to keep both sides within normal working hours. Remember to re-check the window in March and November (or March/October for European zones) when DST transitions can shift the overlap by 1 hour.
Yes. GMT (Greenwich Mean Time) observes Daylight Saving Time. Clocks spring forward to BST (UTC+1) on the last Sunday in March, and fall back to GMT on the last Sunday in October. During the DST period, the difference with IST changes by 1 hour. In summer the UK switches to BST (British Summer Time, UTC+1). The GMT label itself never changes; it always means UTC+0. Our converter always uses the current offset for the date you select.
Major cities in the GMT (Greenwich Mean Time, UTC+0) timezone include: London (winter), Dublin (winter), Edinburgh, Reykjavik, Accra, Dakar. These cities switch to BST (UTC+1) from the last Sunday in March to the last Sunday in October.
Major cities in the IST (India Standard Time, UTC+5:30) timezone include: Mumbai, New Delhi, Bangalore, Chennai, Kolkata, Hyderabad, Pune. IST is a fixed-offset zone - these cities do not observe Daylight Saving Time.
IST is 5 hours 30 minutes ahead of GMT. The best overlap for business hours is 09:00–11:30 GMT = 14:30–17:00 IST. Always include both local times in calendar invites (for example, "2:00 PM GMT / 7:30 PM IST IST"). Double-check around March and November (or March/October for European zones) when DST transitions can shift the offset by 1 hour. For full scheduling guidance, see our international meeting times guide.
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