Kathmandu is 12.75 hours ahead of Vancouver
There is no standard 8-to-6 overlap. Someone joins early or late.
Practically speaking, Vancouver and Kathmandu never share office hours; 12.75 hours of separation keeps their days apart. To talk live, someone has to flex: an early start in Vancouver can catch the tail end of the day in Kathmandu, or the other way round. Note the seasonal wrinkle: when Vancouver is on daylight saving and Kathmandu isn't, the gap between them grows or shrinks by an hour.