Nairobi is 2 hours behind Islamabad
Best overlap: 10:00 AM to 6:00 PM in Islamabad is 8:00 AM to 4:00 PM in Nairobi.
The overlap falls at 10:00 AM to 6:00 PM in Islamabad, or 8:00 AM to 4:00 PM if you're in Nairobi. With 8 hours in common, treat scheduling almost as if the two cities were in the same region.