Count both endpoints while excluding 25 December
Input and settings
2024-12-23 to 12-30 / Include both ends Weekly days off: Sun, Sat / Holiday: 2024-12-25
Expected result
5 business days: 23, 24, 26, 27 and 30 December
Business Days Calculator
Count business days between dates, or add and subtract business days from a date.
How to use
- Choose a business-day count or add/subtract business days.
- Enter dates or a day count and check the weekend and holiday exclusions.
- Review the result together with the start/end inclusion settings.
Calculation type
The start date is day 0. Counting begins with the next or previous business day. With 0 business days, the start date is returned even if it is a weekend or holiday.
Choose days off that repeat each week. Enter specific dates under Additional holidays.
Result
Choose between a date range and an N-business-day offset
With Saturday and Sunday off and no additional holidays, September 4–11, 2026 contains five business days when the start is excluded and the end included. In “Add / subtract business days”, adding five days from September 4 also gives September 11; the start is day 0. Adding 2026-09-09 as a holiday reduces the range to four business days and moves the five-business-day target to September 14. Both modes use your weekly days off and additional holidays, including schedules where Saturday is a working day.
About this tool
Choose between counting business days in a range and moving forward or backward by a set number of business days. In add / subtract mode, the start date is day 0.
Selected weekly days off and additional holidays are excluded. Saturday and Sunday are selected by default. Public holidays are not added automatically, so enter the dates that apply to you.
Try a use case and check the result
Check business-day counts and date offsets using your explicit holiday list and weekly days off.
Example buttons replace the inputs and settings above and calculate. Restore previous input steps back one example at a time. After trying multiple examples, repeat restore to return to your original input. This history is lost when the page closes.
Move two business days with only 30 December registered
Input and settings
Base 2024-12-27 / Add 2 business days Weekly days off: Sun, Sat / Only holiday: 2024-12-30
Expected result
Wednesday, January 1, 2025 5 calendar days; 3 skipped. Unlisted 1 January counts.
How to read the result
The interval example removes two weekend days and one listed holiday from eight calendar dates. Offsets start counting after the base date. National holidays are not added automatically. In the second example, unlisted 1 January counts as a business day; enter the actual closures you need.
Scope and limits
Intervals require start ≤ end with at most 36,600 days difference. Offsets accept 0–100,000 whole business days; zero returns the base date even on a day off. All seven weekdays cannot be disabled. Half-days, opening hours, regional holiday databases and statutory deadlines are not modeled. Separate YYYY-MM-DD holidays with whitespace or commas.
Verification: existing functions are checked for endpoint inclusion, custom weekly days off, listed and unlisted dates, year rollover and zero offsets. Both interfaces are checked for restoration of checkboxes, modes and original input.
Continue with the next task
Calculating long periods
The between-dates mode allows a difference of up to 36,600 days. Business-day offsets accept up to 100,000 business days, with results limited to years 0001–9999.
Dates and settings
Dates, custom holidays, weekly days off and the selected calculation mode are not autosaved. Business-day calculations run in the browser; the tool does not retrieve holiday lists from an external service.
Frequently asked questions
Are public holidays removed automatically?
No. Add the holidays you want to exclude; the tool does not assume a country.
Can I exclude either endpoint?
Yes. Start and end dates have separate inclusion options.
Is the start date counted when adding or subtracting?
No. The start date is day 0, and the next or previous business day is day 1. With 0 business days, the start date is returned unchanged.
Are custom holidays saved?
No. The entered dates are not stored.
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Inputs and storage
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