MDorval

>>>>只有登陆后才算成为加拿大居民，而不是从拿到签证开始算，对吧？

Yes, you are right. Next year when you file the tax return you will be asked to provide the landing date.

But you can file gst/hst表 at some point this year, I don't know this kind of infomation. You better search on this web or ask people who knows.