There is no time difference between Delhi and Kolkata. Both cities use India Standard Time (IST, UTC+5:30). When it's 9:00 AM in Delhi, it's also 9:00 AM in Kolkata.
India uses a single timezone across the entire country, so all major cities remain synchronized year-round.
Any time works! Since both cities share the same timezone, you can schedule calls during standard business hours (9:00 AM - 5:00 PM) without any time conversion needed.
Delhi and Kolkata are connected by direct flights taking about 2 hours. Kolkata is the cultural capital of Eastern India and was the former capital of British India, while Delhi is the current national capital.