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Date add and subtract calculator
Move a calendar date by a signed number of days, weeks, months or years.
Numbers and dates
Text
Browser only
Runs locally in your browser. Your files, pasted content and generated output are not uploaded. Reset clears this tool’s working data.
This tool needs JavaScript. If it does not load, refresh the page and try again.
How to use this tool
- Enter values using decimal points and choose the operation or assumptions shown.
- Select Calculate and review the numerical result and its stated conventions.
- Download the result or amortization schedule when available. Reset restores the example inputs.
Examples
2024-01-31 plus one month clamps to 2024-02-29.
Limitations
- Runs locally. Decimal calculations use floating-point arithmetic, rounded to 12 significant digits; monetary displays use two decimals. Exact integer and fraction results are labelled separately.
- Proleptic Gregorian calendar, years 0001–9999, with UTC civil dates. Month/year offsets clamp the day to the last day of the target month. No timezone, holidays or daylight-saving adjustment.
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