IST to GMT converter
GMT is 5 hours 30 minutes behind IST all year. Both zones keep the same relationship through the daylight saving changes, so the gap in 2026 never moves.
IST to GMT conversion table
Every hour of the day in IST and what it is in GMT. The columns use a January date and a July date, so you can see how daylight saving changes the answer.
| Time in IST | Time in GMT |
|---|---|
| 12 AM | 6:30 PM previous day |
| 1 AM | 7:30 PM previous day |
| 2 AM | 8:30 PM previous day |
| 3 AM | 9:30 PM previous day |
| 4 AM | 10:30 PM previous day |
| 5 AM | 11:30 PM previous day |
| 6 AM | 12:30 AM |
| 7 AM | 1:30 AM |
| 8 AM | 2:30 AM |
| 9 AM | 3:30 AM |
| 10 AM | 4:30 AM |
| 11 AM | 5:30 AM |
| 12 PM | 6:30 AM |
| 1 PM | 7:30 AM |
| 2 PM | 8:30 AM |
| 3 PM | 9:30 AM |
| 4 PM | 10:30 AM |
| 5 PM | 11:30 AM |
| 6 PM | 12:30 PM |
| 7 PM | 1:30 PM |
| 8 PM | 2:30 PM |
| 9 PM | 3:30 PM |
| 10 PM | 4:30 PM |
| 11 PM | 5:30 PM |
How to convert IST to GMT
To convert IST to GMT by hand, subtract 5 hours 30 minutes for most of the year, then fix the date if you cross midnight.
- 8 PM IST on 15 January is 2:30 PM GMT.
- 8 PM IST on 15 October is 2:30 PM GMT.
UTC is the easy anchor: convert to UTC first, then to the other zone, and you never have to think about which side changed its clocks.
About the two time zones
India Standard Time (IST). Used in: Delhi, Mumbai, Bengaluru, Kolkata, Chennai. No daylight saving: the offset is the same all year.
India is UTC+5:30, so conversions often end in :30. IST can also mean Irish Standard Time or Israel Standard Time; here it means India.
Greenwich Mean Time (GMT). Used in: Reykjavik and much of West Africa use GMT all year. No daylight saving: the offset is the same all year.
GMT and UTC show the same time. The UK is on GMT only in winter; in summer it moves to BST, which is one hour ahead. This page uses the fixed GMT (UTC+0) zone.
Skip the converter: let Herewise do it on every page
Herewise is a free Chrome extension. When a page says "8 PM EST", "75°F" or "$49", it adds a small label with the time, temperature or price in your own time zone, units and currency. Free, no account, nothing you read leaves your browser.
Questions
What is 8 PM IST in GMT?
8 PM IST on 15 January is 2:30 PM GMT.
Is GMT ahead of or behind IST?
GMT is 5 hours 30 minutes behind IST all year. Both zones keep the same relationship through the daylight saving changes, so the gap in 2026 never moves.
Does daylight saving change the difference between IST and GMT?
No. India Standard Time: No daylight saving: the offset is the same all year. Greenwich Mean Time: No daylight saving: the offset is the same all year.
How can I see IST times in my own time zone automatically?
Install Herewise, a free Chrome extension. When a web page says a time like 8 PM IST, it adds a small label with that time in your own time zone, using the correct date for daylight saving.