Japanese Era Converter

The Japanese Era Converter is an online tool for bidirectional conversion between Japanese era dates (Wareki) and Western calendar dates. It supports five modern eras: Meiji (from 1868), Taisho (from 1912), Showa (from 1926), Heisei (from 1989), and Reiwa (from 2019).

Enter a Western date to get the corresponding Japanese era date, or enter an era name, year, month, and day to get the Western equivalent. Era boundary dates are handled precisely, so transitions like 'Heisei 31 April 30' to 'Reiwa 1 May 1' are converted correctly.

Useful for government documents, resumes, contracts requiring Japanese era notation, and researching historical dates. All processing is done entirely in your browser, so no data is ever transmitted externally.