Date Calculator

Add or subtract days, weeks, months, or years from any date. Calculate the exact difference between two dates.

Start Date

Amount

Unit

Subtract (instead of add)

Business days only (exclude weekends)

From Date

To Date

Business days only (exclude weekends)

Result Date

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How Date Calculation Works

The date calculator handles all date arithmetic accurately, including leap years (years divisible by 4, except centuries not divisible by 400). When adding/subtracting months, the day is adjusted to the last day of the target month if the original day exceeds the target month's length.

About this Calculator

The Date Calculator is a free, easy-to-use tool for add, subtract, days between. Simply enter your values and get instant, accurate results — no signup, no ads, no tracking. All calculations run locally in your browser, so your data stays completely private.

Privacy Note: All calculations are performed locally in your browser. No data is ever sent to a server or third party.