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