Tokyo is 16 hours ahead of Calgary during MST, and 15 hours ahead during MDT. Calgary uses Mountain Time (MST/MDT) while Tokyo uses Japan Standard Time (JST, UTC+9). When it's 5:00 PM in Calgary, it's 9:00 AM the next day in Tokyo.
Japan does not observe daylight saving time while Calgary does, so the difference varies between 15-16 hours throughout the year.
Best calling time: 4:00 PM - 8:00 PM Calgary time. This corresponds to 8:00 AM - 12:00 PM the next day in Tokyo, catching morning business hours in Japan.
Calgary and Tokyo are on nearly opposite sides of the globe. Japan is an important trading partner for Alberta's energy sector. Flights typically connect through Vancouver or Seattle.