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Age & Date Calculator
exact age, days between dates, add days, Japanese era
Results update as you type. Includes Japanese era (Reiwa, Heisei, Showa…) conversion and a printable age chart.
- Local
- No upload
- No sign-up
- Free
How to use it
- Pick a tab: Age, Days between, Add / subtract, Japanese era or Age chart.
- Enter the dates; results update as you type.
- Print the age chart or copy the result when you need it.
FAQ
How is age calculated?
In completed years: you gain a year on your birthday. People born on 29 February have their birthday on 28 February in common years.
How are era boundaries handled?
By the exact change date: 30 April 2019 is Heisei 31, and Reiwa 1 starts on 1 May 2019. Japan used a lunisolar calendar before 1873, so day-level conversion starts then.
How is the Japanese school grade worked out?
Children born 2 April to 1 April of the next year share a grade, and start elementary school in the April after turning 6.
Which zodiac year is used?
The calendar year, as on Japanese New Year cards. By the lunar calendar, people born before Lunar New Year may belong to the previous sign.
Are my files uploaded to a server?
No. The tool runs in your browser; your files and anything you enter are processed on your device only. The site only counts how often tools are opened and finished, never their contents.
Do I need to sign up or pay?
No. Every tool is free, needs no sign-in and has no watermark or usage limit.
Does it work on my phone?
Yes, in a recent Chrome, Safari or Edge. For large files a computer is faster.
Still have a question or found a bug? Let us know.