How does this calculator account for leap years and different month lengths?

The calculator checks the exact number of days in each specific month and year interval (including 29 days in February during leap years) to ensure mathematical precision.

What happens if the target date is in the past relative to the start date?

The calculator detects the inverted order and displays an elapsed countdown notice while calculating the exact positive span between the two points.

Is my birthdate or personal date data stored or tracked?

No. All date calculations execute 100% locally in your web browser via client-side JavaScript. No information is stored or sent to any server.

Age & Date Calculator | Calculate Exact Years, Months & Days