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Date difference and age calculators

Age, date difference, and date arithmetic calculators for elapsed days, milestones, and scheduling checks.

The date category focuses on portable tools for age checks, elapsed time, future dates, and everyday scheduling work.

Age CalculatorCalculate your age in full years and the total number of days since birth.
Days Between Dates CalculatorCalculate elapsed days and inclusive days between two dates.
Date CalculatorAdd or subtract days, weeks, months, and years from a base date.