Istanbul and Geneva Time Zone Comparison
Istanbul and Geneva are two major cities that sit in noticeably different time zones. Istanbul and Geneva sit on different continents, in noticeably different time zones, and at least one of them observes daylight saving time.
Because Istanbul and/or Geneva 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 Geneva is easy — a normal business-hours slot works for both sides on the same calendar day.