🇮🇳 Kolkata (Calcutta), India
22
- India Standard Time
- UTC+5:30
- Daytime
☀️ 05:32 · 🌙 17:17 · 11 h 46 min
Kolkata (Calcutta) to London: time difference
London is 4 h 30 min behind Kolkata (Calcutta). Live clocks for both, the working hours they share, and how each one sits against your own time.
−4 h 30 min
Your time
One day, 2 clocks
Drag along the band to read any hour in every place at once.
Kolkata (Calcutta) 09:03 9:03 AM London 04:33 4:33 AM You –:–
09:03 9:03 AM
India Standard Time · UTC+5:30
☀️ 05:32 · 🌙 17:17
04:33 4:33 AM
British Summer Time · UTC+1
☀️ 07:16 · 🌙 18:20
·
−4 h 30 min
London is 4 h 30 min behind Kolkata (Calcutta).
When you, Kolkata (Calcutta) and London are all at the desk
Pick the working hours below – the window every location shares appears once your time zone is known.
Working hours
🇮🇳 Kolkata (Calcutta)
0 12 AM 1 1 AM 2 2 AM 3 3 AM 4 4 AM 5 5 AM 6 6 AM 7 7 AM 8 8 AM 9 9 AM 10 10 AM 11 11 AM 12 12 PM 13 1 PM 14 2 PM 15 3 PM 16 4 PM 17 5 PM 18 6 PM 19 7 PM 20 8 PM 21 9 PM 22 10 PM 23 11 PM
🇬🇧 London
19:30 7:30 PM 20:30 8:30 PM 21:30 9:30 PM 22:30 10:30 PM 23:30 11:30 PM 0:30 12:30 AM 1:30 1:30 AM 2:30 2:30 AM 3:30 3:30 AM 4:30 4:30 AM 5:30 5:30 AM 6:30 6:30 AM 7:30 7:30 AM 8:30 8:30 AM 9:30 9:30 AM 10:30 10:30 AM 11:30 11:30 AM 12:30 12:30 PM 13:30 1:30 PM 14:30 2:30 PM 15:30 3:30 PM 16:30 4:30 PM 17:30 5:30 PM 18:30 6:30 PM
📍 Your time
- Asleep
- Early
- Working hours
- Evening
- Both working
- Right now
Time zones side by side
| Detail | 🇮🇳 Kolkata (Calcutta) | 🇬🇧 London |
|---|---|---|
| Local time | 09:03 | 04:33 |
| Local date | Saturday, October 10, 2026 | Saturday, October 10, 2026 |
| Time zone | India Standard Time | British Summer Time |
| UTC offset | UTC+5:30 | UTC+1 |
| Offset from Kolkata (Calcutta) | — | −4 h 30 min |
| IANA zone | Asia/Kolkata | Europe/London |
| Daylight saving | Not observed | On summer time → UTC+0, Oct 25, 01:00 |
| Sunrise | 05:32 | 07:16 |
| Sunset | 17:17 | 18:20 |
| Daylight | 11 h 46 min | 11 h 4 min |
| People on this clock | 4,486,679 | 8,908,083 |
Compare Kolkata (Calcutta) with another city
More comparisons with Kolkata (Calcutta): the time zones next to it and the far side of the clock.
Nearby time zones
Big time differences
Kolkata (Calcutta) and London: common questions
How far behind Kolkata (Calcutta) is London?
London is 4 hours and 30 minutes behind Kolkata: UTC+1 against UTC+5:30.
What time is it in London at the start of the working day in Kolkata (Calcutta)?
The working day in Kolkata starts at 9:00 AM; in London it is 4:30 AM at that moment.
What time is it in London when it is 6:00 PM in Kolkata (Calcutta)?
When it is 6:00 PM in Kolkata, it is 1:30 PM in London.
When is a good time to call London from Kolkata (Calcutta)?
Between 1:30 PM and 6:00 PM in Kolkata – that is 9:00 AM to 1:30 PM in London – both places are within working hours (9:00 AM–6:00 PM).
When does the date change in London compared with Kolkata (Calcutta)?
The new day starts in London later: until 4:30 AM in Kolkata, it is still the previous day there. From 7:30 PM in London, Kolkata is already on the next day.
Is the time difference between Kolkata (Calcutta) and London the same all year?
No. Only London switches to summer time, so the gap changes twice a year. From October 25, 2026, London will be 5 hours and 30 minutes behind Kolkata.
