Time difference: Kolkata vs London
London is 4.5 hours behind Kolkata.
Kolkata is in the IST time zone (UTC+05:30) while London uses BST (UTC+01:00).
The offset between these two cities changes during the year because they do not share the same daylight saving schedule.
London is 4.5 hours behind Kolkata.
Kolkata is in the IST time zone (UTC+05:30) while London uses BST (UTC+01:00).
Because Kolkata and London do not share the same daylight saving schedule, the time difference between them changes during the year.
Hour-by-hour conversion
When it's the given hour in Kolkata, here are the local times elsewhere.
| Kolkata | London |
|---|---|
| 00:00 | 19:30 -1 |
| 01:00 | 20:30 -1 |
| 02:00 | 21:30 -1 |
| 03:00 | 22:30 -1 |
| 04:00 | 23:30 -1 |
| 05:00 | 00:30 |
| 06:00 | 01:30 |
| 07:00 | 02:30 |
| 08:00 | 03:30 |
| 09:00 | 04:30 |
| 10:00 | 05:30 |
| 11:00 | 06:30 |
| 12:00 | 07:30 |
| 13:00 | 08:30 |
| 14:00 | 09:30 |
| 15:00 | 10:30 |
| 16:00 | 11:30 |
| 17:00 | 12:30 |
| 18:00 | 13:30 |
| 19:00 | 14:30 |
| 20:00 | 15:30 |
| 21:00 | 16:30 |
| 22:00 | 17:30 |
| 23:00 | 18:30 |
Frequently Asked Questions
London is 4.5 hours behind Kolkata.
A good window is 13:30–17:00 in Kolkata, which is 09:00–12:30 in London. Both sides are inside 9:00–17:00 working hours.
London is 4.5 hours behind Kolkata.
Kolkata and London do not share the same DST schedule, so the time offset between them changes by an hour during parts of the year.
Kolkata uses Asia/Kolkata and London uses Europe/London. These are the identifiers used by operating systems and APIs to compute local time.
A good reverse window is 09:00–12:30 in London, which is 13:30–17:00 in Kolkata. Both sides are inside 9:00–17:00 working hours.