Working Days Calculator — Business Days Between Dates
Count business days between two dates, or add N working days to a date — with your weekend and your holidays.
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Count the working days between two dates, or find the date N business days from now — skipping weekends and any holidays you list. The weekend is configurable (Saturday–Sunday, Friday–Saturday, Sunday only) because the working week isn't the same everywhere, and holidays are yours to paste in rather than a built-in calendar that might be wrong for your country, region or company.
Deadlines, notice periods, delivery estimates, "10 business days" refund promises — this is the arithmetic behind all of them.
How to use Working Days Calculator
- Pick a mode: days between two dates, or add a number of working days to a date (negative to go back).
- Set your weekend and, if relevant, paste public holidays one per line.
- Decide whether the end date counts — the difference between "5 days from Monday is Friday" and "is Saturday".
- Read the result and the breakdown: calendar days, weekend days and holidays skipped.
Inclusive or exclusive — the off-by-one everyone hits
Monday to Friday is five working days if both ends count and four if you count the days between them. Neither is wrong; they answer different questions. "How many days will I be working?" includes both. "How many days until the deadline?" usually excludes today. The checkbox makes the choice explicit rather than guessing for you.
"Within 10 business days"
Contracts and refund policies count forward from the day after the trigger event — day zero is the day it happened. That's how the "add" mode works: 10 working days from a Friday lands on the Friday two weeks later, skipping four weekend days. If a holiday falls in that span, it pushes a further day.
Weekends aren't universal
Saturday–Sunday covers most of the world, but Friday–Saturday is the weekend in much of the Middle East, and some countries and industries have a six-day week. Choose the pattern that matches where the work is done, not where you are.
Holidays: why there is no built-in list
Public holidays vary by country, then by region (Bavaria and Berlin differ), then by employer, and some move every year. A confidently wrong built-in list would give confidently wrong deadlines. Paste the dates that apply to you — your HR calendar or a government list — one per line as YYYY-MM-DD. Anything unparsable is flagged, never silently dropped.
For plain calendar arithmetic (days between dates, age), the age calculator covers it; for the exact hour across zones, the time zone converter.
Frequently asked questions
Should I count the end date?
If you're asking "how many days will I work between these dates?", yes — both ends. If you're asking "how many working days until X?", usually no — today isn't a full day of waiting. The checkbox makes the choice explicit; the difference is exactly one day.
How is "10 business days from today" counted?
Today is day zero; the first business day after it is day one. From a Friday, ten business days lands on the Friday two weeks later. Holidays in between each push the result one more working day out. Use the "add" mode.
Why isn't there a built-in holiday calendar?
Because holidays depend on country, region, employer and year, and a confidently wrong list produces confidently wrong deadlines. Paste the dates that apply to you from an official source — one per line — and the tool applies exactly those.
Can I use a Friday–Saturday or six-day week?
Yes — the weekend dropdown offers Saturday–Sunday, Friday–Saturday, Sunday only, or no weekend at all. Pick the pattern of the place where the work happens.
Does daylight saving affect the count?
No. Dates are treated as whole calendar days, independent of clock changes, so a span across a DST switch counts correctly. Some naive tools that subtract timestamps lose or gain a day there; this one can't.