Islamabad is 2 hours behind Ho Chi Minh City
Best overlap: 10:00 AM to 6:00 PM in Ho Chi Minh City is 8:00 AM to 4:00 PM in Islamabad.
Target 10:00 AM to 6:00 PM in Ho Chi Minh City, which lands at 8:00 AM to 4:00 PM for the Islamabad side. That's a roomy 8 hours of common time each day, so finding a slot that suits everyone is rarely a problem.