Islamabad is 4 hours ahead of Zurich
Best overlap: 8:00 AM to 2:00 PM in Zurich is 12:00 PM to 6:00 PM in Islamabad.
Plan around 8:00 AM to 2:00 PM in Zurich, which is 12:00 PM to 6:00 PM in Islamabad, to catch everyone during office hours. That's a roomy 6 hours of common time each day, so finding a slot that suits everyone is rarely a problem. Note that Zurich follows daylight saving while Islamabad stays put, so the times above drift by an hour seasonally.