IST to GMT Converter & Meeting Planner
Quick answer: 9:00 AM IST = 3:30 AM GMT (fixed +05:30 standard offset — not DST-adjusted). Use the interactive converter below for DST-aware local-time scheduling.
Planning a call or meeting between Indian Standard Time (IST) and Greenwich Mean Time (GMT)? You need to account for the standard time difference. Greenwich Mean Time is normally 5.5 hours behind Indian Standard Time. Whether you are coordinating between teams in Mumbai and New Delhi and London and Dublin, our live tool has you covered. Use our interactive overlap studio below to find the perfect waking hours for both regions, taking into account any seasonal Daylight Saving Time (DST) changes.
24-Hour Conversion Table
Quick reference: 12:00 AM IST = 6:30 PM GMT. The full 24-hour IST to GMT table below uses fixed standard offsets for exact abbreviation searches.
Example: 3:00 PM IST = 9:30 AM GMT.
| IST Time | GMT Time |
|---|---|
| 12:00 AM (00:00) | 6:30 PM (18:30)-1 day |
| 1:00 AM (01:00) | 7:30 PM (19:30)-1 day |
| 2:00 AM (02:00) | 8:30 PM (20:30)-1 day |
| 3:00 AM (03:00) | 9:30 PM (21:30)-1 day |
| 4:00 AM (04:00) | 10:30 PM (22:30)-1 day |
| 5:00 AM (05:00) | 11:30 PM (23:30)-1 day |
| 6:00 AM (06:00) | 12:30 AM (00:30) |
| 7:00 AM (07:00) | 1:30 AM (01:30) |
| 8:00 AM (08:00) | 2:30 AM (02:30) |
| 9:00 AM (09:00) | 3:30 AM (03:30) |
| 10:00 AM (10:00) | 4:30 AM (04:30) |
| 11:00 AM (11:00) | 5:30 AM (05:30) |
| 12:00 PM (12:00) | 6:30 AM (06:30) |
| 1:00 PM (13:00) | 7:30 AM (07:30) |
| 2:00 PM (14:00) | 8:30 AM (08:30) |
| 3:00 PM (15:00) | 9:30 AM (09:30) |
| 4:00 PM (16:00) | 10:30 AM (10:30) |
| 5:00 PM (17:00) | 11:30 AM (11:30) |
| 6:00 PM (18:00) | 12:30 PM (12:30) |
| 7:00 PM (19:00) | 1:30 PM (13:30) |
| 8:00 PM (20:00) | 2:30 PM (14:30) |
| 9:00 PM (21:00) | 3:30 PM (15:30) |
| 10:00 PM (22:00) | 4:30 PM (16:30) |
| 11:00 PM (23:00) | 5:30 PM (17:30) |
Best time to call London from Mumbai
For most work calls, compare the normal business day in Mumbai (IST) with the business day in London (GMT). IST commonly covers South Asia, while GMT is mainly associated with Europe, Africa.
⚠️ Note: 2026-07-05 is not a normal workday in one or both regions based on their configured calendar. The overlap below should be treated as a reference, not a guaranteed office-hours window.
✅ The most practical overlap on 2026-07-05 is usually 1:30 PM - 6:30 PM IST, which corresponds to 9:00 AM - 2:00 PM GMT. This window sits inside the typical IST workday (9:30 AM - 6:30 PM) and the GMT workday (9:00 AM - 5:00 PM).
- DST Safety: IST or GMT may shift during Daylight Saving Time. Always confirm the converted time for your specific date.
- Bombay Stock Exchange (BSE): 09:15-15:30 local time in Mumbai.
- London Stock Exchange: 08:00-16:30 local time in London.
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Frequently Asked Questions
What is the time difference between IST and GMT?
During standard time, Greenwich Mean Time is 5.5 hours behind Indian Standard Time.
Does India observe Daylight Saving Time (DST)?
India does not observe Daylight Saving Time and has not done so since 1945. IST remains fixed at UTC+5:30 every day of the year, meaning the offset between India and any DST-observing country shifts by one hour twice annually when those countries change their clocks.
Why does IST have a 30-minute offset?
India chose the 82.5° East meridian — which passes through Mirzapur in Uttar Pradesh — as its central reference longitude, as it bisects the subcontinent geographically. That meridian sits exactly 5 hours and 30 minutes ahead of the Prime Meridian in Greenwich, producing the UTC+5:30 offset that has defined IST since 1906.
What is the difference between GMT and BST?
GMT (Greenwich Mean Time) is the UK's standard winter offset at UTC+0, observed from the last Sunday in October through the last Sunday in March. BST (British Summer Time) is the daylight saving offset at UTC+1, applied each summer when clocks advance one hour.
Is GMT the same as UTC?
GMT and UTC share exactly the same numerical offset — both represent UTC+00:00 — but they are fundamentally different in nature. UTC is an atomic-clock-based international time standard used as the global reference, while GMT is a geographic time zone legally observed by specific countries including the United Kingdom and Ireland during winter months.