P1 · Date & Time · Processed in your browser
Age Calculator
Enter a birth date and reference date to see complete age, elapsed days, and the next birthday. Your data is processed in your browser.
How to use
- Enter the birth date.
- Enter the reference date used for the calculation.
- Calculate age to see years, months, days, total days, and next birthday.
How it works
The tool uses UTC calendar dates to avoid time-zone distortion and calculates complete years and months before remaining days, respecting month lengths and leap years.
Notes and limitations
- The result is informational and does not replace jurisdiction-specific legal age rules.
- For February 29, a birthday in a non-leap year is treated as February 28 by this tool.
Frequently asked questions
Does it just divide the number of days by 365?
No. It uses real calendar years, months, and days and handles leap years.