Age
Exact Age Calculator
Your age in years, months and days, plus days lived and your next birthday.
Open tool →Age
Age in Hours Calculator
Estimate hours lived using a birth time and an explicit time zone.
1
Your dates
On this deviceYour dates are remembered here for 30 days. No account needed.
2
Your story in numbers
Every date has a story.
Enter your dates to discover your result and the next dates worth keeping.
Understanding your result
The time zone is either UTC or this device’s local zone. If the time is unknown, midnight is used. Local daylight saving changes affect timestamp durations; leap seconds are not included. A chosen reference date is evaluated at midnight.
See a worked example
Illustrative example, as of September 13, 2026.
- Date of birth
- 1991-05-16
- Birth or event time
- 00:00
- Counter time zone
- UTC
309,696 hours
Are my dates sent to a server?
Calculations run in your browser. Your dates stay on this device unless you choose to include them in a sharing link or image. “Clear my dates” removes them from local storage.