Time in Seoul vs Kolkata
Seoul keeps KST (UTC+9) and Kolkata keeps IST (UTC+5:30) today. Kolkata is 3½ hours behind Seoul; the rows below read both clocks live.
The working day, side by side
Hours shaded in both rows are inside working hours in both cities: 09:00–15:00 in Kolkata (12:00–18:00 your time).
| City | 00:00 in Seoul | 01:00 in Seoul | 02:00 in Seoul | 03:00 in Seoul | 04:00 in Seoul | 05:00 in Seoul | 06:00 in Seoul | 07:00 in Seoul | 08:00 in Seoul | 09:00 in Seoul | 10:00 in Seoul | 11:00 in Seoul | 12:00 in Seoul | 13:00 in Seoul | 14:00 in Seoul | 15:00 in Seoul | 16:00 in Seoul | 17:00 in Seoul | 18:00 in Seoul | 19:00 in Seoul | 20:00 in Seoul | 21:00 in Seoul | 22:00 in Seoul | 23:00 in Seoul |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Seoul—— | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 |
| Kolkata—— | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 |
- Working hours
- Shoulder
- Night
- Overlap
Do more with Seoul and Kolkata
Best hours to call
12:00 in Seoul
Inside working hours on both sides
09:00 in Kolkata
13:00 in Seoul
Inside working hours on both sides
10:00 in Kolkata
14:00 in Seoul
Inside working hours on both sides
11:00 in Kolkata
15:00 in Seoul
Inside working hours on both sides
12:00 in Kolkata
Where daylight saving pulls them apart
Neither Seoul nor Kolkata changes its clocks, so the gap above holds all year.
Also useful
Common questions
How many hours ahead is Kolkata of Seoul?
Kolkata is 3½ hours behind Seoul right now. The gap is not fixed: it moves whenever either side changes its clocks.
What is the best time to call between Seoul and Kolkata?
Any hour in 12:00–18:00 Seoul time is inside working hours in both cities.
Do Seoul and Kolkata change clocks on the same date?
Neither city changes its clocks, so the gap between them never moves.