There is no time difference between Zurich and Vienna. Both cities use Central European Time (CET/CEST, UTC+1/+2). When it's 12:00 PM in Zurich, it's also 12:00 PM in Vienna.
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 - 6:00 PM) without any time conversion needed.
Zurich and Vienna are two of Europe's most livable cities with strong connections to finance and culture. Direct flights connect them in about 1 hour. Both cities have rich musical heritages and are major centers for international business and diplomacy.