There is no time difference between Warsaw and Berlin. Both cities use Central European Time (CET/CEST, UTC+1/+2). When it's 12:00 PM in Warsaw, it's also 12:00 PM in Berlin.
Both cities observe daylight saving time on the same schedule as part of the European Union, so they remain synchronized year-round.
Any time works! Since both cities share the same timezone, you can schedule calls during standard business hours (9:00 AM - 6:00 PM) without any time conversion needed.
Warsaw and Berlin are neighboring European capitals with deep historical connections. Germany is Poland's largest trading partner, and there's significant cross-border business activity. Direct trains connect the cities in about 5.5 hours, and flights take just over an hour.