Calgary is 12 hours behind Islamabad
There is no standard 8-to-6 overlap. Someone joins early or late.
Islamabad and Calgary live on different parts of the day. With 12 hours between them, standard working hours simply don't meet. Make the most of handoffs — end-of-day in one city becomes start-of-day in the other, so pass work along rather than meeting live. Don't be caught out by clock changes — Calgary observes daylight saving and Islamabad doesn't, so the offset varies by an hour through the year.