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Japan has had more than one system for designating years.), has been in use since the late 7th century.
Years are numbered within eras, which are named by the reigning Emperor.
After the Second World War, the United States occupied Japan, and stopped the use of kōki by officials.
Today, kōki is rarely used, except in some judicial contexts.
The Japanese naval Zero Fighter was named after this year.
The names of the days come from the five visible planets, which in turn are named after the five Chinese elements (metal, wood, water, fire, earth), and from the moon and sun (yin and yang).
On the origin of the names of the days of the week, also see East Asian Seven Luminaries. These holidays have no religious meaning (except those who believe in Christianity or Judaism).
The 1898 law determining the placement of leap years is officially based on the kōki years, using a formula that is effectively equivalent to that of the Gregorian calendar: if the kōki year number is evenly divisible by four, it is a leap year, unless the number minus 660 is evenly divisible by 100 and not by 400.
Thus, for example, the year Kōki 2560 (AD 1900) is divisible by 4; but 2560 − 660 = 1900, which is evenly divisible by 100 and not by 400, so kōki 2560 was not a leap year, just as in most of the rest of the world. In addition, every month has a traditional name, still used by some in fields such as poetry; of the twelve, Shiwasu is still widely used today.