The Lua error in Module:Unicode_data at line 293: attempt to index local 'data_module' (a boolean value)., also known as Lua error in Module:Unicode_data at line 293: attempt to index local 'data_module' (a boolean value)., 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.
The historical Japanese calendar system defines and parses time in terms of ordinal numbers.
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