About Ageason
Free age and date calculators for people who don’t all use the same calendar.
What this site does
Ageason works out exact ages and dates. Most age calculators assume one calendar and one date format. This site is built for the ones they leave out: Hijri dates in Arabic, Bikram Sambat dates in Nepal, Japanese era years, and day-month-year dates for exam and job forms in India.
- Age calculator: exact age on any date, with an exam age-limit check.
- حساب العمر بالهجري والميلادي: age in the Hijri (Umm al-Qura) and Gregorian calendars.
- 年齢早見表: Japanese age chart by era year, with zodiac animals.
- Nepali age calculator: age in Bikram Sambat and AD.
- Chronological age calculator: years;months;days for test scoring.
How the calculations work
Ages are counted in whole years, then whole months, then the days left over. When a birth date doesn’t exist in a month (the 31st, or 29 February), the last day of that month is used. Totals in days count every calendar day, including leap days.
- Hijri dates use the Umm al-Qura calendar from your browser’s built-in calendar data (the Unicode ICU library used by all major browsers).
- Bikram Sambat dates use the published month lengths for 2000 to 2090 BS.
- Japanese eras switch on their official start dates, for example 1 May 2019 for Reiwa.
Every calculation is checked against automated tests covering leap years, month ends and calendar boundaries.
Who runs it
Ageason is an independent site, built and maintained by a software test engineer. If you spot a wrong result, please get in touch with the dates you entered and what you expected. Corrections are usually made within a few days.
Your privacy
The calculators run entirely in your browser. Dates you enter are never sent to a server or stored by this site. See the privacy policy for details.