Istanbul and Tehran Time Zone Comparison
Istanbul and Tehran are two major cities that sit in noticeably different time zones. Istanbul is Turkey's largest city and historic capital, uniquely straddling Europe and Asia across the Bosphorus strait. Tehran, the capital of Iran, is the country's most populous city and the center of most of its political and economic activity.
Istanbul is always 0.5 hours behind Tehran, with no seasonal change, since neither city's daylight saving rules shift this relationship.
With such a small gap, scheduling a call between Istanbul and Tehran is easy — a normal business-hours slot works for both sides on the same calendar day.