Kolkata and Pune are in the same time zone. Both cities use Indian Standard Time (IST, UTC+5:30). When it's noon in Kolkata, it's also noon in Pune.
India uses a single time zone across the entire country.
Any time works! Since both cities are in the same time zone, scheduling is never an issue.
Kolkata and Pune are both major IT and business centers in India. Direct flights connect them in about 2.5 hours.