Best overlap: 10:00 AM to 6:00 PM in Brisbane is 8:00 AM to 4:00 PM in Shenzhen.
Schedule calls for 10:00 AM to 6:00 PM in Brisbane — your colleagues in Shenzhen will be online from 8:00 AM to 4:00 PM. Shenzhen is 2 hours behind Brisbane, but you still share a generous 8 hours of overlap, so scheduling is easy and there's room to move a meeting when you need to.
The US to Australia gap runs 14 to 19 hours depending on the month, and someone is always in tomorrow. Exact overlap windows for every US coast, the double-DST trap, and a rotation rule that keeps it fair. -