Age and Time duration Calculator
Age & Time Duration Calculator
Find your exact age, or the precise gap between any two dates — down to the day.
Your dates
How this calculator works
Calculating "exact age" sounds simple but isn't quite as straightforward as subtracting years — months have different lengths, and years aren't all 365 days. This tool handles that properly: it counts full years, then full months within the remaining time, then whatever days are left over, borrowing correctly from the previous month when the day count would otherwise go negative (so it never shows something like "3 months, -2 days").
Beyond the year/month/day breakdown, it also converts the same span into total days, weeks, months, and hours — useful for things like "how many days old is my baby" or figuring out a project timeline in hours rather than calendar time. If you mark a date as a birthday, it also counts down to the next occurrence of that date, wrapping to next year automatically once the birthday has passed for the current year.
Frequently asked questions
Why do "total months" and the year/month breakdown sometimes not match perfectly?
The year/month/day breakdown accounts for actual calendar month lengths, while "total months" is a simpler approximation (years × 12 + months) for quick reference — for most dates they'll agree, but around month-end edge cases they can differ by a fraction.
Does this account for leap years?
Yes — since the calculation works directly with real calendar dates (via JavaScript's native Date object), leap years are handled automatically and correctly.
Can I use this for something other than age, like a work anniversary or project deadline?
Absolutely — just uncheck "This is a birth date" and use it as a general date-duration calculator between any two dates, past or future.
Is my date of birth stored or sent anywhere?
No. Everything is calculated locally in your browser — nothing is saved or transmitted.
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