Best overlap: 8:00 AM to 10:00 AM in Perth is 4:00 PM to 6:00 PM in Portland.
Aim for 8:00 AM to 10:00 AM Perth time — that's 4:00 PM to 6:00 PM over in Portland. Portland is 16 hours behind Perth, so you only get about 2 hours of overlap a day — worth locking in a standing time like 8:00 AM in Perth (4:00 PM in Portland) before it slips. Don't get caught out: Portland is the previous day from Perth, so "tomorrow" means different things to each team. Finally, Portland observes daylight saving and Perth doesn't, so this window shifts by an hour for part of the year — recheck it each spring and autumn.
| 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 | ||||||||||||||||||||||||
Portland America/Los Angeles |
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. -