Time in Istanbul vs Osan
Istanbul keeps UTC+3 (UTC+3) and Osan keeps KST (UTC+9) today. Osan 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 Osan (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 |
| Osan—— | 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 Osan
Best hours to call
09:00 in Istanbul
Inside working hours on both sides
15:00 in Osan
10:00 in Istanbul
Inside working hours on both sides
16:00 in Osan
11:00 in Istanbul
Inside working hours on both sides
17:00 in Osan
Where daylight saving pulls them apart
Neither Istanbul nor Osan changes its clocks, so the gap above holds all year.
Also useful
Common questions
How many hours ahead is Osan of Istanbul?
Osan 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 Osan?
Any hour in 09:00–12:00 Istanbul time is inside working hours in both cities.
Do Istanbul and Osan change clocks on the same date?
Neither city changes its clocks, so the gap between them never moves.