Best time to call
São Paulo is 9 hours behind Dhaka. Here are the call windows that respect both your day in Dhaka (Bangladesh) and theirs in São Paulo (Brazil), plus the daylight saving and holiday traps to watch.
7 PM Dhaka
= 10 AM São Paulo
7 PM in Dhaka = 10 AM in São Paulo, inside their hours but early or late for you, so it is your sacrifice to make.
8 PM Dhaka
= 11 AM São Paulo
8 PM in Dhaka = 11 AM in São Paulo, inside their hours but early or late for you, so it is your sacrifice to make.
9 PM Dhaka
= 12 PM São Paulo
9 PM in Dhaka = 12 PM in São Paulo, inside their hours but early or late for you, so it is your sacrifice to make.
Watch out for these
Both cities are loaded with Dhaka as the anchor. Adjust the day or hours to see the overlap shift, including around daylight saving transitions.
Sorted by participants in business hours
Green = inside 9:00–17:00
São Paulo is 9 hours behind Dhaka. From your desk in Dhaka, that means your afternoon is still their morning, and the window where both teams are at their desks is narrower than it looks. The cleanest single slot is 7 PM your time, which lands at 10 AM in São Paulo.
With a gap this wide, there is almost no natural overlap between a 9-to-5 in Dhaka and a 9-to-5 in São Paulo. One side has to stretch. The honest move is to decide in advance whose comfort you are trading away, then rotate it so the same team is not always taking the early or late call. Do not pretend a painless slot exists; it usually does not at this distance.
The recommended slots above are computed against today's offset, which is the safe default. The trap is the twice-a-year daylight saving changeover: Dhaka and São Paulo do not necessarily move their clocks on the same weekend, so for a few weeks each spring and autumn the gap can shift by an hour and every recurring invite quietly misfires. If your call is near a transition date, confirm the exact wall-clock time on both ends rather than trusting the difference.
On these dates both Bangladesh and Brazil are likely off, so do not schedule.