Oslo is 4 hours behind Islamabad
Best overlap: 12:00 PM to 6:00 PM in Islamabad is 8:00 AM to 2:00 PM in Oslo.
Keep meetings inside 12:00 PM to 6:00 PM in Islamabad — that maps to 8:00 AM to 2:00 PM in Oslo. With 6 hours of daily overlap, these two cities are an easy pairing; almost any reasonable hour works. These times hold for most of the year, but Oslo's daylight saving (which Islamabad doesn't use) shifts them by an hour twice annually.