Bucharest is 3 hours behind Islamabad
Best overlap: 11:00 AM to 6:00 PM in Islamabad is 8:00 AM to 3:00 PM in Bucharest.
For a call that suits both sides, look at 11:00 AM to 6:00 PM in Islamabad / 8:00 AM to 3:00 PM in Bucharest. Because you share 7 hours of the workday, there's no need to compromise; book the time that suits the meeting, not the map. Finally, Bucharest observes daylight saving and Islamabad doesn't, so this window shifts by an hour for part of the year — recheck it each spring and autumn.