What counts as a working day
A working or business day is normally any weekday from Monday to Friday that is not a public holiday. This calculator counts Mondays through Fridays between your two dates, includes both the start and the end date, and subtracts any holidays you list that fall on weekdays. If you enter a start date that is later than the end date, the tool swaps them for you. Saturdays and Sundays are always treated as non-working days.
How it counts
The tool steps through each calendar day in the range, checks its day of the week in UTC (so time zones and daylight saving cannot move a date), and increments the counter for weekdays. A holiday only reduces the count if it falls on a weekday inside the range, so listing a holiday that falls on a Saturday does not subtract anything twice. For example, 1 to 31 October 2026 has 31 calendar days and nine weekend days, giving 22 working days. If you list 12 October as a holiday, the result becomes 21.
Entering holidays
Public holidays differ by country, region and sometimes employer, and some move from year to year, so the tool does not guess them. Paste the dates from your official calendar using the YYYY-MM-DD format. You can separate them with spaces, commas, semicolons or line breaks. If an entry has the wrong format, the calculator tells you rather than ignoring it silently.
Where it helps
- Checking delivery or processing times quoted in business days.
- Project planning: how many working days remain until a launch date.
- Estimating notice periods, probation periods and invoice terms.
- Working out leave: how many working days fall in a vacation you plan to take.
Limits
This version assumes a Monday to Friday work week. Some countries and industries work different days, and some contracts define business days differently, so always check the wording that applies to you. Nothing you type is sent to a server; the calculation runs in the page.