Shenzhen is 2.5 hours behind Adelaide
Best overlap: 11:00 AM to 6:00 PM in Adelaide is 8:30 AM to 3:30 PM in Shenzhen.
Your window to reach both cities is 11:00 AM to 6:00 PM in Adelaide, which converts to 8:30 AM to 3:30 PM in Shenzhen. A 7-hour overlap gives you real choice here — early or late in the window both work comfortably. A quick caveat — Adelaide's clocks move for daylight saving and Shenzhen's don't, so the times here are right for only part of the year.