How It Works
Years are added first, then months, clamping each step to month-end, then whole days. Date-only arithmetic uses UTC so daylight-saving changes do not alter the result.
FAQs
How does this calculator work?
Years are added first, then months, clamping each step to month-end, then whole days. Date-only arithmetic uses UTC so daylight-saving changes do not alter the result.
What assumptions should I check?
Check the units and definitions shown beside each input. Results use the values you enter.