Istanbul and Kolkata Time Zone Comparison
Istanbul and Kolkata are two major cities that sit in noticeably different time zones. Geographically, Istanbul sits in the Middle East while Kolkata is located in Asia.
Istanbul is always 2.5 hours behind Kolkata, with no seasonal change, since neither city's daylight saving rules shift this relationship.
With a moderate gap like this, it's worth checking the suggested call window above before scheduling a meeting between Istanbul and Kolkata.