Japanese era name

The Japanese era name (年号, nengō, "year name"), also known as gengō (元号), is a traditional calendar system which began during the reign of Emperor Kōtoku in the 7th century. This calendar has been in use in Japan since the beginning of the 8th century.^[1]

The historical Japanese calendar system defines and parses time in terms of ordinal numbers.

1. ↑ Cite error: The named reference gukansh was used but no text was provided for refs named (see the help page).