Calgary is 7 hours behind Reykjavik
Best overlap: 3:00 PM to 6:00 PM in Reykjavik is 8:00 AM to 11:00 AM in Calgary.
Aim for 3:00 PM to 6:00 PM Reykjavik time — that's 8:00 AM to 11:00 AM over in Calgary. Calgary is 7 hours behind Reykjavik, leaving about 3 hours of daily overlap — enough for most meetings if you don't leave them too late in the day. Finally, Calgary observes daylight saving and Reykjavik doesn't, so this window shifts by an hour for part of the year — recheck it each spring and autumn.