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Free Japanese Era Converter

Convert between the Gregorian calendar and Japanese era years (Meiji, Taisho, Showa, Heisei, Reiwa) — including the era-boundary and gannen (元年) edge cases.

Works offline once loaded
Conversion mode

Gregorian date → Japanese era

🔒 Everything runs in your browser — no dates are ever sent anywhere or added to the page's web address.

How It Works

The tool holds the accession date of each modern Japanese era (Meiji, Taisho, Showa, Heisei, Reiwa) and compares your entered date against those boundaries to work out which era it falls in and what era-year that is.

  1. 1
    Enter a date
    Pick a Gregorian date, or choose an era and type an era-year, month, and day.
  2. 2
    Boundary check
    The date is compared against each era's start day, so era-boundary days (like 1 May 2019, the start of Reiwa) resolve correctly instead of off by one.
  3. 3
    Gannen formatting
    A date that falls in an era's first year is written with 元年 (gannen) instead of 1年, matching how it's actually printed on Japanese forms and calendars.
  4. 4
    Read the result
    See the date in kanji, in romaji, and with its weekday — and copy whichever form you need.

Every conversion happens locally in your browser. No date you enter is ever sent to a server or written into the page's URL.

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Frequently Asked Questions