Phoenix is 9 hours behind Prague

Best overlap: 5:00 PM to 6:00 PM in Prague is 8:00 AM to 9:00 AM in Phoenix.

For the smoothest call, aim inside 5:00 PM to 6:00 PM in Prague, i.e. 8:00 AM to 9:00 AM in Phoenix. Overlap is at a premium — roughly 1 hour — so claim 5:00 PM in Prague (8:00 AM in Phoenix) for recurring calls and keep them on time. Note that Prague follows daylight saving while Phoenix stays put, so the times above drift by an hour seasonally.