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Add/Subtract Days

Add or subtract days, weeks or months from a date. Calculate future or past dates instantly. 100% free.

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Add or Subtract Days from a Date

The Add or Subtract Days calculator is a free online tool that lets you compute a future or past date by adding or subtracting a specific number of days from any starting date. Whether you need to determine a deadline 90 days from today, calculate a contract expiration, count the days until an event, or find a date that occurred a given number of days ago, this utility delivers instant and accurate results with no sign-up required.

Simply enter your starting date, choose whether to add or subtract, type the number of days, and the calculator instantly displays the resulting date including the day of the week. The tool handles leap years, month boundaries, and varying month lengths automatically, so you never have to worry about manual miscalculations. All processing runs entirely in your browser — no data is sent to any server, guaranteeing complete privacy.

Common use cases include contract management (computing 30, 60, or 90-day deadlines), project planning (determining milestone dates), legal calculations (statute of limitations, appeal periods), and personal planning (counting days until vacations or events). The tool also supports negative values, letting you find past dates effortlessly.

This date calculator is part of the facilita.tools collection of free online utilities. All tools are available in Portuguese, English, and Spanish, work on any modern browser, and adapt perfectly to mobile screens and tablets. Explore our suite of calculators and simplify your daily planning tasks.

Frequently Asked Questions

Does the calculator account for leap years?
Yes, the calculator correctly handles leap years. Adding 1 year to February 29 will result in February 28 on non-leap years.
Can I calculate business days only?
Currently the calculator works with calendar days. Business day calculation is planned for a future update.
What happens when I add months to the 31st?
If the resulting month has fewer days, the date adjusts to the last valid day. For example, adding 1 month to January 31 gives February 28 (or 29 in a leap year).