Istanbul, Turkey Kolkata, India

Istanbul is in the +03 timezone (UTC+3) and Kolkata is in the IST timezone (UTC+5:30). The time difference between them is 2h 30m.

Use the timeline above to find overlapping business hours between Istanbul and Kolkata. The "Best time to meet" card highlights the window where both cities are within working hours (9 AM – 6 PM local time).

Neither Istanbul nor Kolkata observes Daylight Saving Time, so the time difference remains constant throughout the year.

Click the pencil icon next to the Istanbul clock and type any time. The Kolkata clock will update instantly, showing the exact corresponding time. You can also pick a date to account for DST changes.