Both offices are open 09:00–10:30 Adelaide time — 1.5 hours together.
09:00 you → 16:30 Vancouver prev day
10:00 you → 17:30 Vancouver prev day
09:00→16:30prev day · Vancouver is at work
10:00→17:30prev day · Vancouver is at work
11:00→18:30prev day · outside Vancouver working hours
12:00→19:30prev day · outside Vancouver working hours
13:00→20:30prev day · outside Vancouver working hours
14:00→21:30prev day · outside Vancouver working hours
15:00→22:30prev day · outside Vancouver working hours
16:00→23:30prev day · outside Vancouver working hours
17:00→00:30outside Vancouver working hours
Working hours assumed 09:00–18:00 local. Offsets include daylight saving where it applies, so this shifts through the year.