GMT to IST Converter & Meeting Planner
Quick answer: 9:00 AM GMT = 2:30 PM IST (fixed +00:00 standard offset — not DST-adjusted). Use the interactive converter below for DST-aware local-time scheduling.
Planning a call or meeting between Greenwich Mean Time (GMT) and Indian Standard Time (IST)? You need to account for the standard time difference. Indian Standard Time is normally 5.5 hours ahead of Greenwich Mean Time. Whether you are coordinating between teams in London and Dublin and Mumbai and New Delhi, 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 GMT = 5:30 AM IST. The full 24-hour GMT to IST table below uses fixed standard offsets for exact abbreviation searches.
Example: 3:00 PM GMT = 8:30 PM IST.
| GMT Time | IST Time |
|---|---|
| 12:00 AM (00:00) | 5:30 AM (05:30) |
| 1:00 AM (01:00) | 6:30 AM (06:30) |
| 2:00 AM (02:00) | 7:30 AM (07:30) |
| 3:00 AM (03:00) | 8:30 AM (08:30) |
| 4:00 AM (04:00) | 9:30 AM (09:30) |
| 5:00 AM (05:00) | 10:30 AM (10:30) |
| 6:00 AM (06:00) | 11:30 AM (11:30) |
| 7:00 AM (07:00) | 12:30 PM (12:30) |
| 8:00 AM (08:00) | 1:30 PM (13:30) |
| 9:00 AM (09:00) | 2:30 PM (14:30) |
| 10:00 AM (10:00) | 3:30 PM (15:30) |
| 11:00 AM (11:00) | 4:30 PM (16:30) |
| 12:00 PM (12:00) | 5:30 PM (17:30) |
| 1:00 PM (13:00) | 6:30 PM (18:30) |
| 2:00 PM (14:00) | 7:30 PM (19:30) |
| 3:00 PM (15:00) | 8:30 PM (20:30) |
| 4:00 PM (16:00) | 9:30 PM (21:30) |
| 5:00 PM (17:00) | 10:30 PM (22:30) |
| 6:00 PM (18:00) | 11:30 PM (23:30) |
| 7:00 PM (19:00) | 12:30 AM (00:30)+1 day |
| 8:00 PM (20:00) | 1:30 AM (01:30)+1 day |
| 9:00 PM (21:00) | 2:30 AM (02:30)+1 day |
| 10:00 PM (22:00) | 3:30 AM (03:30)+1 day |
| 11:00 PM (23:00) | 4:30 AM (04:30)+1 day |
Best time to call Mumbai from London
For most work calls, compare the normal business day in London (GMT) with the business day in Mumbai (IST). GMT commonly covers Europe, Africa, while IST is mainly associated with South Asia.
⚠️ 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 9:00 AM - 2:00 PM GMT, which corresponds to 1:30 PM - 6:30 PM IST. This window sits inside the typical GMT workday (9:00 AM - 5:00 PM) and the IST workday (9:30 AM - 6:30 PM).
- DST Safety: GMT or IST may shift during Daylight Saving Time. Always confirm the converted time for your specific date.
- London Stock Exchange: 08:00-16:30 local time in London.
- Bombay Stock Exchange (BSE): 09:15-15:30 local time in Mumbai.
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Frequently Asked Questions
What is the time difference between GMT and IST?
During standard time, Indian Standard Time is 5.5 hours ahead of Greenwich Mean Time.
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.
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.