Colombo is 3.5 hours ahead of Bucharest
Best overlap: 8:30 AM to 2:30 PM in Bucharest is 12:00 PM to 6:00 PM in Colombo.
The overlap falls at 8:30 AM to 2:30 PM in Bucharest, or 12:00 PM to 6:00 PM if you're in Colombo. Even with Colombo ahead by 3.5 hours, your workdays overlap by a comfortable 6 hours — plenty of flexibility for both sides. Just remember Bucharest changes its clocks for daylight saving and Colombo doesn't, so confirm the overlap whenever the seasons turn.