Add or Subtract Days Calculator
Start from any date and add or subtract a specific number of days to find the resulting date. Choose between calendar days or business days only — perfect for deadline planning and scheduling.
- Add or subtract any number of days
- Calendar days or business days mode
- Shows resulting date and day of week
- Handles months and years automatically
Add or Subtract Days
How to Use the Add/Subtract Days Calculator
Select a starting date, enter the number of days to add or subtract, choose between “Add” or “Subtract” mode, and select whether to count all calendar days or business days only. Click “Calculate” to see the resulting date.
About This Calculator
This tool is perfect for finding due dates, delivery dates, or any date that is a specific number of days away from a starting point. In business days mode, it automatically skips Saturdays and Sundays. All calculations happen locally in your browser.
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Frequently Asked Questions
Common questions about adding or subtracting days
In business days mode, the calculator skips Saturdays and Sundays when counting. For example, adding 5 business days from a Friday gives you the following Friday, not the next Wednesday.
Yes! The calculator correctly handles crossing month boundaries, year boundaries, leap years, and all calendar rules. Adding 60 days from December 15 will correctly land in February of the next year.
Yes, the calculator handles subtraction across any date range. Subtracting 365 days from January 1, 2025 will correctly give you January 1, 2024.
There is no practical limit. The calculator can handle thousands or even millions of days. However, extremely large numbers may result in dates far in the future that have less practical use.