Karachi is 3 hours ahead of Copenhagen
Best overlap: 8:00 AM to 3:00 PM in Copenhagen is 11:00 AM to 6:00 PM in Karachi.
Keep meetings inside 8:00 AM to 3:00 PM in Copenhagen — that maps to 11:00 AM to 6:00 PM in Karachi. Karachi is 3 hours ahead of Copenhagen, but you still share a generous 7 hours of overlap, so scheduling is easy and there's room to move a meeting when you need to. Remember that Copenhagen shifts for daylight saving and Karachi doesn't, so recalculate the overlap after each clock change.