There is no time difference between Berlin and Amsterdam. Both cities use Central European Time (CET, UTC+1 in winter and CEST, UTC+2 in summer). When it's 9:00 AM in Berlin, it's also 9:00 AM in Amsterdam.
Both cities observe daylight saving time on the same EU schedule, 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.
Berlin and Amsterdam are neighboring European capitals with strong cultural and economic ties. High-speed trains connect the two cities in about 6 hours, while flights take just over an hour.