Karachi is 3 hours ahead of Oslo
Best overlap: 8:00 AM to 3:00 PM in Oslo is 11:00 AM to 6:00 PM in Karachi.
Oslo and Karachi overlap from 8:00 AM to 3:00 PM (Oslo) to the equivalent 11:00 AM to 6:00 PM in Karachi — that's your meeting window. A 7-hour overlap gives you real choice here — early or late in the window both work comfortably. Note the seasonal wrinkle: when Oslo is on daylight saving and Karachi isn't, the gap between them grows or shrinks by an hour.