The relative time of day

If it is possible to quantify any aspect of Japanese society, an official body in Japan is bound to do it. That includes the time of day. Not only the clock time but the general divisions of the day in colloquial terms. We need only turn to the "Daily Time Subdivision Map" as defined by the Japan Meteorological Agency.

Midnight 3:00 AM 6:00 AM 9:00 AM Noon (正午)  3:00 PM 6:00 PM 9:00 PM

–  –  –  –  –  –  –  –

3:00 AM 6:00 AM 9:00 AM Noon (正午)  3:00 PM 6:00 PM 9:00 PM Midnight

Predawn Dawn Morning Before Noon Afternoon Evening Early Night Late Night

Whoa, 3:00 AM counts as dawn and 3:00 PM counts as evening? Well, in Japan, yes. Given the geography, this actually makes sense. The time zone for Japan is UTC +9:00. That's for the entire country, from Okinawa to Hokkaido. Moreover, Tokyo sits on the eastern edge of the meridian at 35 degrees north.

To that bit of geography, consider as well that Japan does not go on Summer Time (サマータイム). As a result, even in the middle of the summer, the sun rises over Tokyo as early as 4:30 AM and sets no later than 7:00 PM. In the middle of the winter, the sun rises before 7:00 AM and sets no earlier than 4:30 PM.

But 7:00 PM is pretty early in the evening compared to Salt Lake City. Salt Lake City is in the middle of the Mountain Time Zone at 40 degrees north and goes on Summer Time (MDT). At the height of the summer, the sun sets at a whopping 9:00 PM. Yet another reason I'm not a big fan of Daylight Saving Time.

Back during the go-go 1980s, when drinking with the boys after hours was de rigueur for every company man in Tokyo (and to a certain extent still is), a popular anecdote claimed that the typical salaryman preferred doing so under cover of the night. That was why Japan resisted going on Summer Time.

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