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Working hours
Start
09
End
18
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AUTO follows the operating system. Working hours drive the green banding on every grid. All four persist on this device only.

Time in Haikou vs Istanbul

Haikou keeps CST (UTC+8) and Istanbul keeps UTC+3 (UTC+3) today. Istanbul is 5 hours behind Haikou; 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: 09:00–13:00 in Istanbul (14:00–18:00 your time).

Haikou and Istanbul hour by hour, with the working-hour overlap shaded
City00:00 in Haikou01:00 in Haikou02:00 in Haikou03:00 in Haikou04:00 in Haikou05:00 in Haikou06:00 in Haikou07:00 in Haikou08:00 in Haikou09:00 in Haikou10:00 in Haikou11:00 in Haikou12:00 in Haikou13:00 in Haikou14:00 in Haikou15:00 in Haikou16:00 in Haikou17:00 in Haikou18:00 in Haikou19:00 in Haikou20:00 in Haikou21:00 in Haikou22:00 in Haikou23:00 in Haikou
Haikou——000102030405060708091011121314151617181920212223
Istanbul——000102030405060708091011121314151617181920212223
  • Working hours
  • Shoulder
  • Night
  • Overlap

Do more with Haikou and Istanbul

Open in the PlannerAdd more cities, find a meeting time that works for everyone, then share it as a link.Open in Watch ViewKeep Haikou, Istanbul and other cities on screen as live clocks, under an animated sky and sun.

Best hours to call

14:00 in Haikou
Inside working hours on both sides
09:00 in Istanbul
15:00 in Haikou
Inside working hours on both sides
10:00 in Istanbul
16:00 in Haikou
Inside working hours on both sides
11:00 in Istanbul
17:00 in Haikou
Inside working hours on both sides
12:00 in Istanbul

Where daylight saving pulls them apart

Neither Haikou nor Istanbul changes its clocks, so the gap above holds all year.

Also useful

Common questions

How many hours ahead is Istanbul of Haikou?

Istanbul is 5 hours behind Haikou right now. The gap is not fixed: it moves whenever either side changes its clocks.

What is the best time to call between Haikou and Istanbul?

Any hour in 14:00–18:00 Haikou time is inside working hours in both cities.

Do Haikou and Istanbul change clocks on the same date?

Neither city changes its clocks, so the gap between them never moves.