Jakarta is 5 hours ahead of Bucharest
Best overlap: 8:00 AM to 1:00 PM in Bucharest is 1:00 PM to 6:00 PM in Jakarta.
For the smoothest call, aim inside 8:00 AM to 1:00 PM in Bucharest, i.e. 1:00 PM to 6:00 PM in Jakarta. With 5 hours to play with, a mid-window meeting keeps things balanced for Bucharest and Jakarta alike. Note that Bucharest follows daylight saving while Jakarta stays put, so the times above drift by an hour seasonally.