Dates & age
Japanese era conversion, an age chart, day counts and business days, period of stay and visa renewal dates, and other date calculators.
Tools
- Japanese era converter
Convert Western years and dates to Japanese era years (Reiwa, Heisei, Showa, Taisho, Meiji) and back. Handles mid-year era changes by exact date and shows the zodiac year and age. Runs in your browser.
- Japanese age chart
Japanese age chart: age by birth year before and after the birthday, Japanese era, zodiac, kazoedoshi and school grade, with a printable A4 PDF (in Japanese).
- Days and business days calculator
Count the days between two dates, with or without the first day, and see the weeks. Also adds days to a date and counts business days with Japanese holidays. Runs in your browser.
Add or subtract days from a dateBusiness days calculator for JapanBusiness days in 2026Business days in 2027
- Japan period of stay and visa renewal calculator
Enter your period-of-stay expiry date to see when you can apply for visa renewal in Japan. Also checks special re-entry permit deadlines and the years of residence needed for permanent residency.