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Date, Time & Productivity

Age Calculator.

Dates, holiday lists and durations remain in this browser. Calculate exact age in years, months, days and total units from two dates. Uses explicit date-only Gregorian rules and independent local verification.

Use Age Calculator

Private in this browser. Dates, durations and user-supplied holiday lists stay in this browser.

Tool options
Preparing the local tool…

How it works

  1. 01

    Enter dates or elapsed durations and select the rules.

  2. 02

    Run the bounded local calculation.

  3. 03

    Review the calendar rules before downloading the verified result.

Frequently asked questions

Does this use my time zone?

No. Date arithmetic is deliberately independent of time zones and daylight-saving changes.

Does Age Calculator upload my data?

Age Calculator runs locally in your browser. Dates, durations and user-supplied holiday lists stay in this browser.

What output does Age Calculator create?

Age Calculator creates Json output after the result passes its local verification checks.

Age Difference CalculatorCalculate exact age gap between two birth dates. Uses explicit date-only Gregorian rules and independent local verification.Days Between Dates CalculatorCalculate calendar days, weekdays, weeks, months and years between dates. Uses explicit date-only Gregorian rules and independent local verification.Add or Subtract Days from a DateAdd or subtract calendar units with explicit month-end behavior. Uses explicit date-only Gregorian rules and independent local verification.
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