There is no time difference between Copenhagen and Berlin. Both cities use Central European Time (CET, UTC+1 in winter and CEST, UTC+2 in summer). When it's 9:00 AM in Copenhagen, it's also 9:00 AM in Berlin.
Both cities observe daylight saving time on the same 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 - 5:00 PM) without any time conversion needed.
Copenhagen and Berlin are just about 1.5 hours apart by plane or 6 hours by train. Both are vibrant European capitals with strong tech scenes and close economic ties within the EU.