Western dates to Japanese era dates

2024/4/1 or 2019-05-01 become 令和6年4月1日 or 令和元年5月1日 in one go, or the short R6.4.1. No upload.

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Dates follow the days the eras changed (平成 ends on 30 April 2019, 令和 starts on 1 May 2019). Dates up to 1872 used the old calendar and are left as they are.

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