Yes, you can request a later date here in Alaska too. I think you can postpone it twice. I've had to do it because I'm away from home 2 weeks at a time. All I did was told them that my work schedule didn't fit with that date and requested that I be moved to such-in-such a week. I didn't have to go into more detail than that. And, all the questions and request for postponement were on the form that they sent me, so I didn't have to talk to anyone. Maybe they have a similar arrangement in Canada?