Kolkata, India Colombo, Sri Lanka

Kolkata is in the IST timezone (UTC+5:30) and Colombo is in the +0530 timezone (UTC+5:30). The time difference between them is 0 hours (same zone).

Use the timeline above to find overlapping business hours between Kolkata and Colombo. The "Best time to meet" card highlights the window where both cities are within working hours (9 AM – 6 PM local time).

Neither Kolkata nor Colombo observes Daylight Saving Time, so the time difference remains constant throughout the year.

Click the pencil icon next to the Kolkata clock and type any time. The Colombo clock will update instantly, showing the exact corresponding time. You can also pick a date to account for DST changes.