Jakarta is 12 hours ahead of Ottawa
There is no standard 8-to-6 overlap. Someone joins early or late.
Practically speaking, Ottawa and Jakarta never share office hours; 12 hours of separation keeps their days apart. To talk live, someone has to flex: an early start in Ottawa can catch the tail end of the day in Jakarta, or the other way round. Note the seasonal wrinkle: when Ottawa is on daylight saving and Jakarta isn't, the gap between them grows or shrinks by an hour.