Convert IST to GMT
GMT is 5.5 hours behind IST. IST is UTC+5:30 and GMT is UTC+0.
Right now: IST · GMT
Best time to schedule a meeting
Standard 9–5 working hours overlap for 2 hours: 3:00 PM–5:00 PM IST (9:00 AM–11:00 AM GMT). Schedule meetings inside that window.
| IST | GMT | Suitable? |
|---|---|---|
| 9:00 AM | 3:30 AM | outside 9–5 |
| 10:00 AM | 4:30 AM | outside 9–5 |
| 11:00 AM | 5:30 AM | outside 9–5 |
| 12:00 PM | 6:30 AM | outside 9–5 |
| 1:00 PM | 7:30 AM | outside 9–5 |
| 2:00 PM | 8:30 AM | outside 9–5 |
| 3:00 PM | 9:30 AM | working hours |
| 4:00 PM | 10:30 AM | working hours |
| 5:00 PM | 11:30 AM | working hours |
IST to GMT conversion table
| IST | GMT |
|---|---|
| 12:00 AM | 6:30 PM (previous day) |
| 1:00 AM | 7:30 PM (previous day) |
| 2:00 AM | 8:30 PM (previous day) |
| 3:00 AM | 9:30 PM (previous day) |
| 4:00 AM | 10:30 PM (previous day) |
| 5:00 AM | 11:30 PM (previous day) |
| 6:00 AM | 12:30 AM |
| 7:00 AM | 1:30 AM |
| 8:00 AM | 2:30 AM |
| 9:00 AM | 3:30 AM |
| 10:00 AM | 4:30 AM |
| 11:00 AM | 5:30 AM |
| 12:00 PM | 6:30 AM |
| 1:00 PM | 7:30 AM |
| 2:00 PM | 8:30 AM |
| 3:00 PM | 9:30 AM |
| 4:00 PM | 10:30 AM |
| 5:00 PM | 11:30 AM |
| 6:00 PM | 12:30 PM |
| 7:00 PM | 1:30 PM |
| 8:00 PM | 2:30 PM |
| 9:00 PM | 3:30 PM |
| 10:00 PM | 4:30 PM |
| 11:00 PM | 5:30 PM |
About IST
India Standard Time (IST) is UTC+5:30. It is used in all of India and Sri Lanka, on a half-hour offset.
About GMT
Greenwich Mean Time (GMT) is UTC+0. It is used in the UK and Ireland in winter, Portugal, Iceland and much of West Africa.
A warning about daylight saving
The abbreviations on this page each denote a single fixed offset, so every figure here is exact. What changes is which abbreviation a place uses. New York is on EST in January and EDT in July, so "New York time" moves by an hour twice a year while EST and EDT themselves never move. When you schedule across zones, name the city rather than the abbreviation, or use UTC — that is what calendar software does internally.
Frequently asked questions
What time is 9:00 AM IST in GMT?
9:00 AM IST is 3:30 AM GMT.
Is GMT ahead of IST?
GMT is 5.5 hours behind IST.
Which time zone does this use?
IST is UTC+5:30 and GMT is UTC+0. Both abbreviations denote a single fixed offset, so this conversion never shifts with daylight saving — what changes is which abbreviation a place is using at the time.