Best overlap: 8:00 AM to 12:00 PM in Prague is 2:00 PM to 6:00 PM in Perth.
Target 8:00 AM to 12:00 PM in Prague, which lands at 2:00 PM to 6:00 PM for the Perth side. Perth is 6 hours ahead of Prague, so you've got a workable 4-hour overlap — ideal for a standing meeting around 8:00 AM in Prague (2:00 PM in Perth). For part of the year the maths changes: Prague observes daylight saving, Perth does not, shifting the overlap by an hour.
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Prague Europe/Prague | ||||||||||||||||||||||||
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. -