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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 Alcalá de Henares vs Istanbul

Alcalá de Henares keeps CEST (UTC+2) and Istanbul keeps UTC+3 (UTC+3) today. Istanbul is 1 hour ahead of Alcalá de Henares; 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: 10:00–18:00 in Istanbul (09:00–17:00 your time).

Alcalá de Henares and Istanbul hour by hour, with the working-hour overlap shaded
City00:00 in Alcalá de Henares01:00 in Alcalá de Henares02:00 in Alcalá de Henares03:00 in Alcalá de Henares04:00 in Alcalá de Henares05:00 in Alcalá de Henares06:00 in Alcalá de Henares07:00 in Alcalá de Henares08:00 in Alcalá de Henares09:00 in Alcalá de Henares10:00 in Alcalá de Henares11:00 in Alcalá de Henares12:00 in Alcalá de Henares13:00 in Alcalá de Henares14:00 in Alcalá de Henares15:00 in Alcalá de Henares16:00 in Alcalá de Henares17:00 in Alcalá de Henares18:00 in Alcalá de Henares19:00 in Alcalá de Henares20:00 in Alcalá de Henares21:00 in Alcalá de Henares22:00 in Alcalá de Henares23:00 in Alcalá de Henares
Alcalá de Henares——000102030405060708091011121314151617181920212223
Istanbul——000102030405060708091011121314151617181920212223
  • Working hours
  • Shoulder
  • Night
  • Overlap

Do more with Alcalá de Henares 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 Alcalá de Henares, Istanbul and other cities on screen as live clocks, under an animated sky and sun.

Best hours to call

09:00 in Alcalá de Henares
Inside working hours on both sides
10:00 in Istanbul
10:00 in Alcalá de Henares
Inside working hours on both sides
11:00 in Istanbul
11:00 in Alcalá de Henares
Inside working hours on both sides
12:00 in Istanbul
12:00 in Alcalá de Henares
Inside working hours on both sides
13:00 in Istanbul

Where daylight saving pulls them apart

Alcalá de Henares next changes on Sunday 25 October 2026. Between those two dates the gap between the cities is an hour different from the one shown above — which is exactly when a recurring meeting drifts. Every date we track is on the daylight saving page.

Also useful

Common questions

How many hours ahead is Istanbul of Alcalá de Henares?

Istanbul is 1 hour ahead of Alcalá de Henares right now. The gap is not fixed: it moves whenever either side changes its clocks.

What is the best time to call between Alcalá de Henares and Istanbul?

Any hour in 09:00–17:00 Alcalá de Henares time is inside working hours in both cities.

Do Alcalá de Henares and Istanbul change clocks on the same date?

Only one of them does, so the gap between them changes twice a year even though neither city moved relative to the sun.