Shanghai is 12 hours ahead of Montreal

There is no standard 8-to-6 overlap. Someone joins early or late.

The 12-hour difference means Montreal and Shanghai miss each other entirely during regular office hours. Where you can, lean on async updates and save live calls for when one team is happy to start early or stay late. Don't be caught out by clock changes — Montreal observes daylight saving and Shanghai doesn't, so the offset varies by an hour through the year.