Date Calculator
Add or subtract days from a date. Start date plus or minus N days = result date.
How to Use
Enter your values in the fields above and click Calculate to get instant results. All computations run locally in your browser. No data is ever uploaded or stored.
Related Calculators
Date Addition and Subtraction
CalcSolver's date calculator adds or subtracts days, weeks, months, or years from any starting date — handling month boundaries, leap years, and end-of-month edge cases correctly. It's essential for project planning, deadline tracking, and scheduling.
Adding 90 days to January 15 gives April 14 (not April 15, because February has 28 days in non-leap years). Adding 6 months to August 31 gives February 28 (or 29 in a leap year) — since February doesn't have 31 days, the calculator adjusts to the last valid day.
Business applications include: calculating contract end dates, determining filing deadlines, tracking warranty expiration, and planning recurring schedules. For time spans between two known dates, use CalcSolver's date difference calculator instead.
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Frequently Asked Questions
How do I add days to a date?
Enter the start date and the number of days to add. The calculator counts forward, accounting for varying month lengths and leap years, and shows the resulting date.
How do I subtract days from a date?
Enter the start date and the number of days to subtract. Use a negative number or select the subtract option. The calculator counts backward from the start date.
Can I add weeks or months instead of days?
Yes, you can add or subtract days, weeks, or months. Adding 3 months to January 31 gives April 30 (adjusted for the shorter month). Adding 4 weeks is the same as adding 28 days.