When to use this calculator
Move a date by a signed number of Monday-to-Friday working days. The starting date is not counted. Public holidays are not excluded. Zero returns the starting date.
Explore the business days & weekends calculators for other questions in this topic. For a related calculation, use the Business Days Calculator: Count Monday-to-Friday dates in a start-inclusive, end-exclusive interval.
PUTTING IT INTO PRACTICE
Add Business Days: a worked example
The values below are an illustrative example, not a recommendation. Replace them with measurements or assumptions that match your question.
| Input | Example value |
|---|---|
| Starting date | 2026-10-16 |
| Business days to add (integer) | 1 |
| Result | 2026-10-19 |
- Check the input labels and enter the example values above.
- Apply the relationship: Move one date at a time and count Monday-to-Friday dates after the start..
- The result is 2026-10-19 , rounded for display.
How to interpret your result
The starting date is not counted. Public holidays are not excluded. Zero returns the starting date.
The default workweek is Monday to Friday. Date ranges use the inclusive and exclusive boundaries stated on each tool. No country holiday list is inferred, and special working Saturdays or weekends require a different calendar model.
Frequently asked questions
Are public holidays excluded automatically?
Only when you enter them in the holiday-list tool. Ordinary business-day tools here exclude Saturdays and Sundays but not public holidays.
When is the add business days calculator useful?
Move a date by a signed number of Monday-to-Friday working days. The starting date is not counted. Public holidays are not excluded. Zero returns the starting date.
How do I use the add business days calculator?
Enter starting date, business days to add (integer). The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
Move one date at a time and count Monday-to-Friday dates after the start..
What should I check before using the result?
The starting date is not counted. Public holidays are not excluded. Zero returns the starting date.
How are results rounded?
Scalar numbers display up to six decimal places, with scientific notation for very large or small values. Text, fraction, date and schedule outputs use the format described on the tool. Intermediate calculations use JavaScript floating-point arithmetic. Keep sensible precision for your measurements.
Further reading
For background on this topic, see MDN: date values and calendar handling ↗. This is a topic reference, not an external review or endorsement of this tool.
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