Business Days Calculator
Count business days between two dates, or add business days to a date. Weekends are excluded and holidays can be toggled.
The built-in holiday set covers the year 2026 only. Dates outside 2026 are treated as non-holidays unless you add them below.
Business days
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How to use
- In Count mode, enter the first and last dates of the period. In Add mode, enter a start date and a number of business days.
- Saturdays and Sundays are always excluded. Use the checkbox to also exclude Japanese national holidays (built-in set covers 2026 only).
- Add your own holidays, such as company shutdown days, one date per line in the text box.
Notes
In Count mode, both endpoints are included when they are business days. In Add mode, the start day itself is not counted; counting begins on the next business day, and negative numbers move backwards. The built-in Japanese holiday set covers 2026 only, including substitute holidays.
FAQ
- What about holidays in 2027?
- The built-in set covers 2026 only, so 2027 holidays are not excluded automatically. Enter the ones you need in the additional holidays box.