Islamabad is 12 hours ahead of Vancouver
There is no standard 8-to-6 overlap. Someone joins early or late.
A 12-hour difference puts Vancouver and Islamabad out of sync — when one team is mid-morning, the other is fast asleep. Consider rotating the inconvenience: one week Vancouver takes the early call, the next week Islamabad does. These times hold for most of the year, but Vancouver's daylight saving (which Islamabad doesn't use) shifts them by an hour twice annually.