Best overlap: 8:00 AM to 12:00 PM in Perth is 2:00 PM to 6:00 PM in Honolulu.
For a call that suits both sides, look at 8:00 AM to 12:00 PM in Perth / 2:00 PM to 6:00 PM in Honolulu. Honolulu is 18 hours behind Perth, leaving about 4 hours of daily overlap — enough for most meetings if you don't leave them too late in the day. Be careful with invites: Honolulu is on the previous day, so a Monday meeting for Perth may land on a different day there.
| Local time | 12am | 1am | 2am | 3am | 4am | 5am | 6am | 7am | 8am | 9am | 10am | 11am | 12pm | 1pm | 2pm | 3pm | 4pm | 5pm | 6pm | 7pm | 8pm | 9pm | 10pm | 11pm |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Perth Australia/Perth | ||||||||||||||||||||||||
Honolulu Pacific/Honolulu |
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. -