Age Calculator
Civil calendar age in the local timezone of this device. Leave As of blank to use today.
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How to calculate age
- Enter the date of birth.
- Leave As of empty for today, or pick another calendar date.
- Read years, months, days, totals, weekday born, and next birthday.
- Civil calendar in this device's local timezone.
Age
Civil calendar difference from a birth date
| Years | Full years completed |
|---|---|
| Months | Extra months after those years |
| Days | Extra days after those months |
| Total days | Whole midnights between the two local dates |
How age is counted here
Age is the civil difference from the date of birth to the as-of date: whole years, then leftover months, then leftover days. February 29 births on a non-leap as-of date follow the calendar date that exists in that year. Total days is the difference of those local calendar dates.
As-of date
Leave as-of empty to use today on this device. That 'today' is the local calendar date, not UTC. If you need a specific reporting date, type it. The as-of date must be on or after the date of birth.
Not a legal age proof
School cutoffs, insurance, and courts may count age from a different midnight or time zone. This page does not apply those rules. Pair with the date difference calculator if you only need whole days between two dates.