Dhaka is 3 hours ahead of Helsinki
Best overlap: 8:00 AM to 3:00 PM in Helsinki is 11:00 AM to 6:00 PM in Dhaka.
The hours that work for both Helsinki and Dhaka are 8:00 AM to 3:00 PM (Helsinki) and 11:00 AM to 6:00 PM (Dhaka). Plenty of room to work with: 7 hours of daily overlap means you can prioritise people's preferences over the clock. One seasonal catch: Helsinki springs forward and falls back, but Dhaka doesn't, so the gap changes by an hour for several months of the year.