Date Calculator
The Date Calculator is a fast, offline‑ready tool for date math. Whether you need to know how many days remain until a deadline, the precise duration between two events, or what date it will be after adding a specific number of days, this tool delivers accurate results instantly. It automatically handles leap years, month‑end boundaries, and all edge cases of the Gregorian calendar. No installation, no sign‑up — just enter your dates and get the answer.
How to Use
- 1Choose your calculation mode: Days Between Dates or Add/Subtract Days.
- 2Fill in the required fields — two dates for the difference, or a base date and the number of days to add/subtract, plus the operation.
- 3Click the Calculate button to see the result displayed immediately below the controls.
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Frequently Asked Questions
Does it account for leap years?
Yes, the calculation uses your browser's built‑in date system, which correctly handles leap years and all calendar rules.
Can I calculate business days only?
Currently the tool calculates total calendar days. Support for business‑day calculation may be added in a future Pro version.
Is my data sent anywhere?
No. All calculations happen entirely inside your browser; no dates or results are ever transmitted over the internet.