London to Kolkata
Converting a fixed time. Europe/London → Asia/Kolkata · 7,963 km (4,945 miles) apart
Clocks go back 1 hour on Sunday, 25th October 2026, at 1:59 am local time (1:00 am after the change).
Clocks here do not change — this zone stays on the same offset all year.
Convert a specific time minutes work, not just whole hours
Hour by hour
| London | Kolkata | 24h | Good to call? |
|---|---|---|---|
| 12am | 4am | 00:00 → 04:30 | asleep in Kolkata |
| 1am | 5am | 01:00 → 05:30 | asleep in Kolkata |
| 2am | 6am | 02:00 → 06:30 | asleep in Kolkata |
| 3am | 7am | 03:00 → 07:30 | asleep in London |
| 4am now | 8am | 04:00 → 08:30 | asleep in London |
| 5am | 9am | 05:00 → 09:30 | asleep in London |
| 6am | 10am | 06:00 → 10:30 | asleep in London |
| 7am | 11am | 07:00 → 11:30 | awake, not at work |
| 8am | 12pm | 08:00 → 12:30 | awake, not at work |
| 9am | 1pm | 09:00 → 13:30 | both at work |
| 10am | 2pm | 10:00 → 14:30 | both at work |
| 11am | 3pm | 11:00 → 15:30 | both at work |
| 12pm | 4pm | 12:00 → 16:30 | both at work |
| 1pm | 5pm | 13:00 → 17:30 | awake, not at work |
| 2pm | 6pm | 14:00 → 18:30 | awake, not at work |
| 3pm | 7pm | 15:00 → 19:30 | awake, not at work |
| 4pm | 8pm | 16:00 → 20:30 | awake, not at work |
| 5pm | 9pm | 17:00 → 21:30 | awake, not at work |
| 6pm | 10pm | 18:00 → 22:30 | asleep in Kolkata |
| 7pm | 11pm | 19:00 → 23:30 | asleep in Kolkata |
| 8pm | 12am Fri | 20:00 → 00:30 | asleep in Kolkata |
| 9pm | 1am Fri | 21:00 → 01:30 | asleep in Kolkata |
| 10pm | 2am Fri | 22:00 → 02:30 | asleep in Kolkata |
| 11pm | 3am Fri | 23:00 → 03:30 | asleep in Kolkata |
Call times
Both places are at work between 9am and 13:00 in London — 1pm to 4pm at the other end.
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Questions people ask
What time is it in Kolkata when it is 11:00 pm in London?
3:30 am in Kolkata the next day.
How many hours ahead is Kolkata of London?
Kolkata is 4 hours 30 minutes ahead London. That gap is not fixed: it changes when either place starts or ends daylight saving. The table on this page is recalculated for today, so it is already correct for the current season.
What is the best time to call between London and Kolkata?
Both places are at work between 9am and 13:00 in London — 1pm to 4pm at the other end.
When does the difference between London and Kolkata change?
London: Clocks go back 1 hour on Sunday, 25th October 2026, at 1:59 am local time (1:00 am after the change). Kolkata does not change its clocks, so the gap shifts by an hour on that date.