Dhaka is 30 minutes ahead of Kolkata. Kolkata uses Indian Standard Time (IST, UTC+5:30) while Dhaka uses Bangladesh Standard Time (BST, UTC+6). When it's 12:00 PM in Kolkata, it's 12:30 PM in Dhaka.
Neither city observes daylight saving time, so the 30-minute difference remains constant year-round.
Best calling time: 8:30 AM - 5:30 PM Kolkata time. This corresponds to 9:00 AM - 6:00 PM in Dhaka, covering standard business hours.
Kolkata and Dhaka are neighboring cities with deep historical and cultural ties. Kolkata is the capital of West Bengal, while Dhaka is the capital of Bangladesh. They share Bengali language and culture. The cities are about 350 km apart.