Date Add / Subtract Calculator

Shift a Calendar Date

This calculator adds or subtracts whole years, months, and days from a selected date.

Method: change year/month first, then day count, using JavaScript calendar date rules.

Understanding Date Add and Subtract

1. What This Calculator Measures

Date add and subtract calculations shift a calendar date by selected years, months, and days.

2. How the Calculation Works

The calculator applies the year and month change first, then moves the date by the day count.

3. Formula or Rule Used

result date = start date +/- years, months, and days.

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