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The calendar was created in 425 during the Genka era in Chinese history.
The Genka-reki system was brought to Japan from Korea by a Buddhist monk. The earliest record of this calendar in Japan is in the 10th month of the 10th year of the reign of Empress Suiko (602).
- Nussbaum, Louis-Frédéric. (2005). "Calendar" in Japan Encyclopedia, pp. 98-99; Reischauer, Robert Karl (1937). Early Japanese history, pp. 140, 162.
- Nussbaum, "Genka-reki" at p. 238; Bramsen, William. (1880). Japanese chronological tables, p. 25.
- Japan, Monbushō. (1876). An outline history of Japanese education: prepared for the Philadelphia International Exhibition, 1876, p. 160.
- Needham, Joseph. (1959). Science and civilisation in China, Mathematics and the sciences of the heavens and the earth, Vol. 3, p. 391 note d.
- Barnes, Gina Lee. (2007). State Formation in Japan: Emergence of a 4th-Century Ruling Elite, p. 226 n.5.