Best overlap: 2:00 PM to 6:00 PM in Honolulu is 8:00 AM to 12:00 PM in Perth.
Aim for 2:00 PM to 6:00 PM Honolulu time — that's 8:00 AM to 12:00 PM over in Perth. You share roughly 4 hours a day. That's enough for regular meetings, but treat the window as prime time and guard it. One thing to flag — this overlap crosses the date line, so Perth is on the next day relative to Honolulu.
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Honolulu Pacific/Honolulu | ||||||||||||||||||||||||
Perth Australia/Perth |
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. -