Instant Japanese Era Converter — Keyboard or Voice Input
Japan uses two parallel calendar systems: the Gregorian calendar (2026, 2025 …) and the traditional era-name system (Reiwa 8, Heisei 30 …). Official documents often require one or the other, and converting between them by mental arithmetic gets old fast. I built a small PWA to make that friction disappear.
Type It or Say It
There are two ways to enter a date.
Type a Japanese era date — 令和8年5月10日 — into the text box and press Enter. The app detects the format automatically and returns the Gregorian equivalent: 2026年5月10日. It works in reverse too: type 2026/5/10 and you get 令和8年5月10日 back. Same input field, same button, both directions.
Prefer not to type? Tap the microphone button and speak. End your phrase with the particle “wa” — say “Reiwa roku-nen jūni-gatsu mikkawa” — and the app converts automatically the moment you finish speaking. Handy when your other hand is occupied.
Year Only, Year + Month, or Full Date
The converter handles three levels of precision:
令和元年→2019年昭和64年1月→1989年1月2024/12/3→令和6年12月3日
Enter a bare four-digit year like 2019 and the app surfaces every era that overlaps it — in this case both Heisei 31 and Reiwa 1.
Supported eras: Meiji, Taisho, Showa, Heisei, Reiwa.
No Install Required — Works Offline Too
Open it in any browser and it’s ready. Add it to your home screen and it launches like a native app. After the first load it works offline, so it’s always there when you need it.