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Subtract Business Days Calculator

Pick a start date and how many business days to subtract.

How it is calculated

Starting from the date you enter (start, written YYYY-MM-DD), the tool steps back one calendar day at a time. A day only counts toward days if it is a Monday to Friday; Saturdays and Sundays are skipped. It stops when days weekdays have been counted, and shows that date with its weekday, plus how many calendar days that spans. Public holidays are not excluded: only weekends are, so if your deadline rules also skip bank holidays or use a different working week, move the result back by hand. The start day itself is not counted. The number of days must be between zero and 100,000 and is rounded to a whole number; an invalid date such as 2026-02-30 gives no result. With 0 days the start date is returned unchanged.

Worked example

Start on Monday 2026-03-16 and subtract 10 business days. Step 1: walking back, the weekdays counted are 13, 12, 11, 10, 9 March (5 days), then the weekend of 7-8 March is skipped. Step 2: continue with 6, 5, 4, 3, 2 March, which brings the count to 10. Step 3: the result is 2026-03-02 (Monday). Step 4: that is 14 calendar days earlier, so ten business days equal exactly two calendar weeks here. The tool reports 14 days and 10 business days.

Try this example →

Common mistakes

  • Assuming public holidays are skipped. Only Saturdays and Sundays are, so a bank holiday inside the range makes the true result one day earlier.
  • Counting the start day as day one. The first business day subtracted is the one before the start date, so subtracting 1 from a Monday gives the previous Friday.
  • Mixing up business days and calendar days in a contract. A 10 business day notice is normally about two weeks, not ten days.
  • Starting from a weekend date and expecting it to count. Subtracting 1 from a Sunday gives Friday, because Saturday is skipped and Sunday is only the starting point.
  • Typing the date as DD/MM/YYYY. The tool needs YYYY-MM-DD and returns no result for other formats or for dates that do not exist.

About this calculator

This calculator counts backward from a start date by a given number of business days — weekdays only, skipping every Saturday and Sunday — to find the resulting date. Unlike simply subtracting calendar days, subtracting business days means the calculator has to step through each day, check whether it falls on a weekend, and only count the weekdays toward the total, which is why “10 business days before” a Friday lands more than two calendar weeks earlier.

This is how payroll systems compute pay periods, how courts and government agencies calculate legal notice or filing deadlines that are defined in business days rather than calendar days, and how contracts and SLAs back-calculate a required start date from a fixed deadline (for example, “shipping must begin no later than 5 business days before the delivery date”).

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Comments (1)

  • Editorial team

    For deadlines that skip holidays, run it twice: first with your number of days, then count the weekday holidays that fall inside the range and run it again with that many extra days. A holiday on a Saturday or Sunday does not count twice. Check the new range for further holidays. Which country's holidays do you need to skip?

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