Best overlap: 2:00 PM to 6:00 PM in Perth is 8:00 AM to 12:00 PM in Oslo.
Both offices are open during 2:00 PM to 6:00 PM Perth time, which is 8:00 AM to 12:00 PM in Oslo. Roughly 4 hours of common time means scheduling is manageable; just avoid the very edges of the window. Because only Oslo changes its clocks, the overlap above isn't fixed; expect a one-hour shift when Oslo enters or leaves daylight saving.
| 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 | ||||||||||||||||||||||||
Oslo Europe/Oslo |
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. -