Calculate years between dates, add or subtract years with precision
Tip: Calculate the exact time span between any two dates including leap years.
Example: Add 5 years to January 1, 2020 = January 1, 2025
Example: Subtract 3 years from December 31, 2025 = December 31, 2022
Results
Years Calculator – Accurate Age and Duration in Years, Months, and Days
The Years Calculator at Years Calculator determines the exact time span between a start date (such as a birthdate) and an end date (typically today or a future date). Using the Western Gregorian calendar, it calculates the difference in years, months, and days—accounting for leap years and whether the anniversary (e.g., birthday) has occurred in the end year.
How it works:
- Subtracts the start year from the end year to get a base year count.
- If the end month/day is earlier than the start month/day, it reduces the year count by 1—since the birthday hasn’t yet occurred.
- Computes the remaining months and days precisely, respecting actual calendar lengths (e.g., February 28 vs. 29 in leap years).
Example:
Born on November 15, 2006, the age on March 10, 2026, is 19 years, 3 months, and 24 days—not 20—because November comes after March.
Common uses:
- Verifying exact age for legal or official documents
- Calculating work experience or project duration
- Measuring intervals between any two dates
➤ Related
Note: This tool follows the Gregorian system; cultural age methods (e.g., traditional Chinese age) differ by counting a person as 1 year old at birth