Calgary is 13 hours behind Jakarta

There is no standard 8-to-6 overlap. Someone joins early or late.

Calgary is 13 hours behind Jakarta, which is far enough that a normal 9-to-5 in one city never reaches the other's working hours. One practical option: Calgary dials in early while it's still late afternoon or evening in Jakarta. These times hold for most of the year, but Calgary's daylight saving (which Jakarta doesn't use) shifts them by an hour twice annually.