Date & Time
Age Calculator
Calculate exact age in years, months, and days.
Enter a birth date to calculate age.
How to use
- Enter a birth date in YYYY-MM-DD format.
- Optionally set an as-of date (defaults to today).
- Read years, months, days, and total days lived.
About this tool
Age is calculated using calendar dates in UTC to avoid timezone edge cases around midnight. Results are informative, not legal determinations of age for eligibility.
FAQ
Which timezone is used?
Dates are interpreted as calendar dates (YYYY-MM-DD) without applying a local time-of-day, which keeps day boundaries consistent.
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