How are leap years handled?

Leap years are accounted for: dates such as Feb 29 are interpreted by the browser's Date object, which knows the actual calendar.

Does it count partial days?

No — the years/months/days breakdown counts whole days. The "total hours" figure reflects elapsed milliseconds for more granularity.

Yes. The target date defaults to today but you can set it to any date — past or future.

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Compute exact age from a date of birth. See your age in years, months, days, weeks, hours, and days until your next birthday.

Date of birth

Age at date

26 years 4 months 19 days

9,636

Total days

1,376

Total weeks

231,264

Total hours

226d

Next birthday