There is no time difference between Chennai and Kolkata. Both cities use India Standard Time (IST, UTC+5:30). When it's 12:00 PM in Chennai, it's also 12:00 PM in Kolkata.
India uses a single timezone across the entire country, so all major Indian cities are synchronized.
Any time works! Since both cities share the same timezone, you can schedule calls during standard business hours (9:00 AM - 6:00 PM) without any time conversion needed.
Chennai and Kolkata are major metropolitan cities on India's east coast. Chennai is known for IT and automotive industries, while Kolkata is a historic cultural and commercial center. Flights between them take about 2 hours.