Istanbul and Poznan Time Zone Comparison
The distance between Istanbul and Poznan is felt not just in kilometers, but in time zones too. Istanbul and Poznan sit on different continents, in noticeably different time zones, and at least one of them observes daylight saving time.
Because Istanbul and/or Poznan observe daylight saving time for part of the year, the gap between them isn't fixed — it ranges between 1 and 2 hours depending on the season.
With such a small gap, scheduling a call between Istanbul and Poznan is easy — a normal business-hours slot works for both sides on the same calendar day.