Add days to a date
Add or subtract calendar days or business days from a starting date.
How to read this result
Calendar mode counts every date, including weekends and public holidays. Business mode counts only the selected weekdays, excluding public holidays in your chosen territory.
The starting date does not count as a step. Adding one business day to a Friday returns Monday if Monday is a scheduled working day and is not a holiday. Subtracting one business day from Monday reaches the preceding Friday under the same settings. Zero days returns the starting date unchanged.
This tool follows your settings. It does not apply special legal rules for deadlines, notice periods or automatic extensions.
Useful answers
How do I move backwards?
Choose “Subtract” and enter a positive number of days.
Can I ignore public holidays?
Yes. Select “No public holidays” to use only your weekday pattern.
Data checked on 8 September 2026 · Sources and methods