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