Genka calendar

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The Genka calendar (元嘉暦, Genka-reki), also known as Yuan-chia li, was a Japanese lunisolar calendar (genka reki).[1] It was used from 604 to 680.[2]


The calendar was created in 425 during the time of China's Southern and Northern Dynasties. It is named after (the translation of) the era in Chinese history.[3]

The Genka-reki system was brought to Japan from Korea by a Buddhist monk.[4] The earliest record of this calendar in Japan is in the 10th month of the 10th year of the reign of Empress Suiko (602).[3]

Dates in the Nihon Shoki before the late 7th century were likely recorded using the Genka calendar system.[5]

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