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Age Difference Calculator
Count complete years, months, and days between two birth dates.
- Calendar interval
- 2 years 1 months 1 days
- Total days
- 760
How the calculation works
Complete calendar months are counted with month-end clamping, followed by remaining days.
Inputs
- First birth date
- Second birth date
Calculation details
The final day is not added separately; identical dates give zero duration.
A February 29 anniversary is clamped to February 28 in a non-leap year. This is a calendar comparison, not a legal age determination.
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Updated: 2026-10-02