IST to GMT
India is 5 hours and 30 minutes ahead of Greenwich Mean Time.
Times may vary due to daylight saving time.Quick answer. GMT is 5 hours and 30 minutes behind IST, and that gap never changes. Neither IST nor GMT observes daylight saving time, so the same conversion is correct on every date of the year.
Time difference
India Standard Time (IST)
IST UTC+5:30 No DST
Mumbai, Delhi, Bengaluru, Chennai, Kolkata, Hyderabad.
India runs on a single time zone, UTC+5:30, and has not observed daylight saving time since 1945. The half-hour offset is why IST conversions rarely land on a round hour.
Greenwich Mean Time (GMT)
GMT UTC+0:00 No DST
Winter time in the UK, Ireland, Portugal and Iceland.
GMT itself is a fixed UTC+0:00. The UK only keeps GMT in winter — from late March to late October London moves to BST (UTC+1:00), so check the BST page if you are scheduling with someone in Britain during the summer.
IST to GMT conversion table
Every hour of the day for 2026. Neither side observes daylight saving, so this table is correct on every date of the year.
| IST | GMT | 24-hour |
|---|---|---|
| 12 AM | 6:30 PM −1 day | 18:30 |
| 1 AM | 7:30 PM −1 day | 19:30 |
| 2 AM | 8:30 PM −1 day | 20:30 |
| 3 AM | 9:30 PM −1 day | 21:30 |
| 4 AM | 10:30 PM −1 day | 22:30 |
| 5 AM | 11:30 PM −1 day | 23:30 |
| 6 AM | 12:30 AM | 00:30 |
| 7 AM | 1:30 AM | 01:30 |
| 8 AM | 2:30 AM | 02:30 |
| 9 AM | 3:30 AM | 03:30 |
| 10 AM | 4:30 AM | 04:30 |
| 11 AM | 5:30 AM | 05:30 |
| 12 PM | 6:30 AM | 06:30 |
| 1 PM | 7:30 AM | 07:30 |
| 2 PM | 8:30 AM | 08:30 |
| 3 PM | 9:30 AM | 09:30 |
| 4 PM | 10:30 AM | 10:30 |
| 5 PM | 11:30 AM | 11:30 |
| 6 PM | 12:30 PM | 12:30 |
| 7 PM | 1:30 PM | 13:30 |
| 8 PM | 2:30 PM | 14:30 |
| 9 PM | 3:30 PM | 15:30 |
| 10 PM | 4:30 PM | 16:30 |
| 11 PM | 5:30 PM | 17:30 |
Highlighted rows are the 3 hours where a 9–6 working day in IST overlaps a 9–5 working day in GMT.
Popular conversion times
| IST | GMT |
|---|---|
| 9 AM IST | 3:30 AM |
| 10 AM IST | 4:30 AM |
| 11 AM IST | 5:30 AM |
| 12 PM IST | 6:30 AM |
| 3 PM IST | 9:30 AM |
| 5 PM IST | 11:30 AM |
| 6 PM IST | 12:30 PM |
| 8 PM IST | 2:30 PM |
Business hours and meeting times
Comparing a 9:00–18:00 working day in IST against 9:00–17:00 in GMT, across the whole week — a slot only counts if it lands on a working day at both ends.
Both sides work Monday to Friday, so the working weeks line up and you share 5 days.
Rows are days in IST. Columns are hours of the IST day.
Best recurring slot
3 PM IST = 9:30 AM GMT , every shared working day
Across the week that is 15 overlapping working hours . The widest day is Monday, with 3 hours.
| Day | Overlap (IST) | Local (GMT) | Hours |
|---|---|---|---|
| Monday | 3 PM – 6 PM | 9:30 AM – 12:30 PM | 3 |
| Tuesday | 3 PM – 6 PM | 9:30 AM – 12:30 PM | 3 |
| Wednesday | 3 PM – 6 PM | 9:30 AM – 12:30 PM | 3 |
| Thursday | 3 PM – 6 PM | 9:30 AM – 12:30 PM | 3 |
| Friday | 3 PM – 6 PM | 9:30 AM – 12:30 PM | 3 |
| Saturday | IST weekend | — | — |
| Sunday | IST weekend | — | — |
About this conversion
India runs on a single time zone, UTC+5:30, and has not observed daylight saving time since 1945. The half-hour offset is why IST conversions rarely land on a round hour.
GMT itself is a fixed UTC+0:00. The UK only keeps GMT in winter — from late March to late October London moves to BST (UTC+1:00), so check the BST page if you are scheduling with someone in Britain during the summer.
Frequently asked questions
What is the time difference between IST and GMT?
GMT is 5 hours and 30 minutes behind IST, on every date of the year. Neither side observes daylight saving time.
What time is 9 AM IST in GMT?
9:00 AM IST is 3:30 AM in GMT, all year round.
What is the best time for a meeting between IST and GMT?
Working days overlap for about 3 hours on a typical Monday: 3 PM to 6 PM IST, which is 9:30 AM to 12:30 PM in GMT. For a recurring invite, 3 PM IST / 9:30 AM GMT is the slot that works on the most days.
Does India observe daylight saving time?
No. India has kept a single UTC+5:30 offset since 1945 and does not use daylight saving time, so IST reads the same on every date of the year. Any change in the gap to GMT comes entirely from the other side.
How many hours a week do IST and GMT actually overlap?
15 hours across the week, spread over 5 working days. 3 PM IST (9:30 AM GMT) is the slot that works on the most days, so it is the one to put in a recurring invite.
Is IST ahead of GMT?
Yes. IST runs ahead of GMT by 5 hours and 30 minutes, so a working morning in IST lands the previous evening or night in GMT.
Converting the other way
Looking up times starting from GMT? Use the GMT to IST converter, which leads with GMT as the starting point and is written for that reader.
Related converters
- IST to EST · Eastern Time
- IST to CST · Central Time
- IST to PST · Pacific Time
- IST to UTC · Coordinated Universal Time
- IST to CET · Central European Time
- IST to GST · Gulf Standard Time
- IST to MST · Mountain Time
- IST to BST · British Summer Time