Vienna is 5 hours behind Jakarta

Best overlap: 1:00 PM to 6:00 PM in Jakarta is 8:00 AM to 1:00 PM in Vienna.

For the smoothest call, aim inside 1:00 PM to 6:00 PM in Jakarta, i.e. 8:00 AM to 1:00 PM in Vienna. Vienna is 5 hours behind Jakarta, so you've got a workable 5-hour overlap — ideal for a standing meeting around 1:00 PM in Jakarta (8:00 AM in Vienna). Daylight saving complicates things slightly: Vienna observes it, Jakarta doesn't, so the difference flexes by an hour part of the year.