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Date Calculator
Calculate date arithmetic and day differences
Runs locally in your browser; input is never uploaded
Date Calculator
Date
Supports date add/subtract (days/weeks/months/years) and days-between calculation.
Usage
Choose date arithmetic or days-between first. Only the date fields and parameters needed by the current mode remain visible; each date field supports typing, pasting or choosing from its date picker. Date arithmetic accepts positive or negative days, weeks, months or years; days-between uses start and end dates.
FAQ
- 1.
What happens when adding one month to January 31?
The result clamps to the last valid day of the target month, such as February 28 in a non-leap year.
- 2.
Why can days between be negative?
The tool calculates end date minus start date. A negative value preserves direction when the end date is earlier.
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