Time in Istanbul vs Ulsan
Istanbul keeps UTC+3 (UTC+3) and Ulsan keeps KST (UTC+9) today. Ulsan is 6 hours ahead of Istanbul; 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: 15:00–18:00 in Ulsan (09:00–12:00 your time).
| City | 00:00 in Istanbul | 01:00 in Istanbul | 02:00 in Istanbul | 03:00 in Istanbul | 04:00 in Istanbul | 05:00 in Istanbul | 06:00 in Istanbul | 07:00 in Istanbul | 08:00 in Istanbul | 09:00 in Istanbul | 10:00 in Istanbul | 11:00 in Istanbul | 12:00 in Istanbul | 13:00 in Istanbul | 14:00 in Istanbul | 15:00 in Istanbul | 16:00 in Istanbul | 17:00 in Istanbul | 18:00 in Istanbul | 19:00 in Istanbul | 20:00 in Istanbul | 21:00 in Istanbul | 22:00 in Istanbul | 23:00 in Istanbul |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Istanbul—— | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 |
| Ulsan—— | 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 Istanbul and Ulsan
Best hours to call
09:00 in Istanbul
Inside working hours on both sides
15:00 in Ulsan
10:00 in Istanbul
Inside working hours on both sides
16:00 in Ulsan
11:00 in Istanbul
Inside working hours on both sides
17:00 in Ulsan
Where daylight saving pulls them apart
Neither Istanbul nor Ulsan changes its clocks, so the gap above holds all year.
Also useful
Common questions
How many hours ahead is Ulsan of Istanbul?
Ulsan is 6 hours ahead of Istanbul right now. The gap is not fixed: it moves whenever either side changes its clocks.
What is the best time to call between Istanbul and Ulsan?
Any hour in 09:00–12:00 Istanbul time is inside working hours in both cities.
Do Istanbul and Ulsan change clocks on the same date?
Neither city changes its clocks, so the gap between them never moves.