IST to GMT converter
GMT is 5.5 hours behind IST right now. Live clocks on both sides, a direct time input, the full 24-hour table with a permalink per hour, and the real daylight-saving state — computed from the IANA tz database on every request, never from a stored offset.
Convert an exact time type it — no sliders
Conversion runs in your browser against the same IANA rules the server uses, so it keeps working offline and nothing you type is sent anywhere.
Daylight saving right now
Greenwich Mean Time
Etc/GMT is currently on GMT (UTC+00:00).
no clock change scheduled — this zone is fixed at UTC+00:00
GMT is UTC+0 and never shifts. The UK observes GMT in winter only — in summer it is on BST (UTC+1), so "GMT" on a British invite dated in July usually means BST.
India Standard Time
Asia/Kolkata is on IST (UTC+05:30).
no clock change scheduled — fixed at UTC+05:30
India Standard Time is UTC+5:30 all year — no daylight saving, and a half-hour offset that trips up naive converters. One clock covers the whole country. Note IST is also Irish Standard Time and Israel Standard Time.
Best time to call green = 09:00–18:00 on both sides
3 overlapping working hours. The longest run is 15:00–18:00 IST, which is 09:30–12:30 GMT.
IST to GMT, hour by hour 13 August 2026 · every row is a permalink
| IST | GMT | 12-hour | Day | Permalink |
|---|---|---|---|---|
| 00:00 | 18:30 GMT | 6:30 PM | previous day | 00:00 → |
| 01:00 | 19:30 GMT | 7:30 PM | previous day | 01:00 → |
| 02:00 | 20:30 GMT | 8:30 PM | previous day | 02:00 → |
| 03:00 | 21:30 GMT | 9:30 PM | previous day | 03:00 → |
| 04:00 | 22:30 GMT | 10:30 PM | previous day | 04:00 → |
| 05:00 | 23:30 GMT | 11:30 PM | previous day | 05:00 → |
| 06:00 | 00:30 GMT | 12:30 AM | same day | 06:00 → |
| 07:00 | 01:30 GMT | 1:30 AM | same day | 07:00 → |
| 08:00 | 02:30 GMT | 2:30 AM | same day | 08:00 → |
| 09:00 | 03:30 GMT | 3:30 AM | same day | 09:00 → |
| 10:00 | 04:30 GMT | 4:30 AM | same day | 10:00 → |
| 11:00 | 05:30 GMT | 5:30 AM | same day | 11:00 → |
| 12:00 | 06:30 GMT | 6:30 AM | same day | 12:00 → |
| 13:00 | 07:30 GMT | 7:30 AM | same day | 13:00 → |
| 14:00 | 08:30 GMT | 8:30 AM | same day | 14:00 → |
| 15:00 | 09:30 GMT | 9:30 AM | same day | 15:00 → |
| 16:00 | 10:30 GMT | 10:30 AM | same day | 16:00 → |
| 17:00 | 11:30 GMT | 11:30 AM | same day | 17:00 → |
| 18:00 | 12:30 GMT | 12:30 PM | same day | 18:00 → |
| 19:00 | 13:30 GMT | 1:30 PM | same day | 19:00 → |
| 20:00 | 14:30 GMT | 2:30 PM | same day | 20:00 → |
| 21:00 | 15:30 GMT | 3:30 PM | same day | 21:00 → |
| 22:00 | 16:30 GMT | 4:30 PM | same day | 22:00 → |
| 23:00 | 17:30 GMT | 5:30 PM | same day | 23:00 → |