How it works
Add or subtract calendar days, counting weekends and holidays. UTC date arithmetic prevents daylight-saving shifts.
Inputs and units
| Input | Example value | What to enter |
|---|---|---|
| Starting date | October 8, 2026 | Choose a valid calendar date. |
| Calendar days to add | 30 | Enter a numeric value. Use a whole number. |
Worked example
Show example inputs and results
This example is generated by the same calculation engine using the starting values in the form. Your own inputs produce your own result.
- Starting date
- October 8, 2026
- Calendar days to add
- 30
Complete example results
- Date (YYYY-MM-DD)
- 2026-11-07
Reading the result
Elapsed calendar time differs from completed years or months. Check interval endpoints, leap-year conventions and any working-day scope.
Questions and answers
Can I use the example values for my own calculation?
The example values illustrate the calculation. Replace every input with your own information, especially dates, rates and the selected operation.
Why are some results rounded?
Results display up to 8 decimal places. Calculations use the unrounded values; very small values use scientific notation. JavaScript floating-point arithmetic can introduce tiny rounding differences.
Are my inputs sent to a server?
The calculator processes inputs in your browser. Its code does not send your values to a server.