Date Difference Calculator — Age on any date, or the number of days between two dates
Two modes: the exact age from a date of birth on any reference date, and the number of days between two dates. For days since arriving in Japan, days until a visa or residence card expires, anniversaries and deadlines.
Count the days to a deadline or anniversary, or find an age on a specific date.
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Date Calculator: tips and things to know
- The age mode takes a reference date, so you can check how old someone was, or will be, on any date, not just today.
- Day counts are handy for visa and residence paperwork: days since arrival, days until a card expires.
- The 100-day mark is a popular milestone for babies (okuizome in Japan) and for couples.
How to use the Date Calculator
Choose a mode
Pick "Age" or "Days between".
Enter the dates
Type the date of birth and reference date, or the start and end dates.
Read the result
The answer updates as you type.
Date Calculator FAQ
Are leap years handled?
Yes. Leap years are taken into account in both modes.
Can I use dates in the past?
Yes. Both past and future dates work, so you can count days since an anniversary or days until a deadline.
How precise is the age?
It is shown in years, months and days.