Calendar days
C = end date − start date + 1
Business days calculator
Calculate the number of working days between two dates (both included), with calendar and weekend days, and find the date reached after a given number of business days.
YYYY-MM-DD, comma-separated; up to 100 dates.
Check dates and exclusions (YYYY-MM-DD). French calendar: 2000–2099; maximum shift: 36,600 working days.
Result
Working days
Calendar days
Weekly rest days
Excluded days outside weekly rest
Both dates are included. The French calendar excludes 11 national holidays; add regional holidays and applicable closures. A weekly rest day is never subtracted twice.
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How does this tool work?
This calculator counts the working days between two dates, both ends included. Choose the working week: Monday to Friday for standard business days, Monday to Saturday for a six-day week (shops, some legal deadlines), or Sunday to Thursday for countries where the weekend falls on Friday and Saturday. It can also shift a date by a number of working days, to find a deadline “within 10 business days”.
Calendar days are every day of the year; business days are the days on which work normally takes place, usually Monday to Friday excluding public holidays. The tool applies the working week you choose and checks every date in the period, start and end dates included.
The shift moves forward (or back, with a negative number) by a number of working days from the start date, without counting that date itself: Friday + 1 business day gives the following Monday. This is how the WORKDAY spreadsheet function behaves, while the count between two dates matches NETWORKDAYS.
The French calendar covers 2000–2099. It does not decide whether a public holiday is a day off at your workplace: select no calendar and enter your exact list if needed, including for Whit Monday. Use custom dates for other countries. Exclusions apply to both counting and shifting, including across New Year.
How to use this tool
Enter the period
Set the start and end dates; both are counted.
Choose the working week
Monday–Friday for business days, Monday–Saturday for a six-day week, Sunday–Thursday for a Friday–Saturday weekend.
Exclude public holidays
Turn on the French calendar (2000–2099) or enter your own dates as YYYY-MM-DD, separated by commas or spaces; they are removed from working days.
Add a shift if needed
Enter a positive or negative number of working days to get the deadline from the start date; excluded holidays are skipped.
Counting working days
Both dates are included. The French calendar excludes 11 national holidays; add regional holidays and applicable closures. A weekly rest day is never subtracted twice.
Working days
W = C − weekly rest days in the period − public holidays falling on a working day
Rule of thumb
W ≈ C × 5 ÷ 7 (Monday–Friday) or C × 6 ÷ 7 (Monday–Saturday)
- C
- number of calendar days, both ends included
- W
- number of working days
The rule of thumb is exact only for whole weeks; the tool counts each day according to its day of the week.
Use cases
Delivery or processing times
Find the date of a delivery promised “within 10 business days” or a reply due in 5 working days.
Working days in a month or year
Both dates are included. The French calendar excludes 11 national holidays; add regional holidays and applicable closures. A weekly rest day is never subtracted twice.
Length of leave
Estimate how many working days a holiday request uses before taking public holidays into account.
Project planning
Measure a team’s capacity between two milestones or push a deadline back by a number of working days.
Examples
Business days in November 2026
November 2026 starts on a Sunday and has 5 Sundays and 4 Saturdays. In the US, subtract Veterans Day (Wednesday 11) and Thanksgiving (Thursday 26) if they are days off: 19 business days.
Input
1 to 30 November 2026
Monday to Friday
No automatic calendar; no custom datesResult
21 working days · 30 calendar days · 9 rest daysDeadline in 10 business days
12 October is not counted: 4 days in the first week, 5 in the second, then Monday the 26th.
Input
Start: Monday 12 October 2026
Shift: 10 days, Monday to Friday
No automatic calendar; no custom datesResult
Monday, October 26, 2026Microsoft’s NETWORKDAYS example
The same result as the NETWORKDAYS documentation, before its holiday list is subtracted.
Input
1 October 2012 to 1 March 2013
Monday to Friday
No automatic calendar; no custom datesResult
110 working daysTips and best practices
- A legal deadline that ends on a weekend or public holiday is often extended to the next working day: check the rule in the applicable text.
- For a deadline in calendar days, use the add or subtract time from a date tool instead.
- To count hours within opening times rather than whole days, use the business hours calculator.
- The calculation link keeps the dates, the working week and the shift, so the other person gets the same deadline.
Sources and references
- Service-Public.fr — Public holidays and May Day in the French private sector (opens in a new tab)Page in French
- Unicode CLDR — Calendars, dates, weeks and locale conventions (opens in a new tab)Page in English
- NETWORKDAYS function (opens in a new tab), Microsoft SupportPage in English
- WORKDAY function (opens in a new tab), Microsoft SupportPage in English
Frequently asked questions
What counts as a business day?
A business day is a day on which businesses are normally open, usually Monday to Friday, excluding public holidays. Some contracts and laws use other definitions, such as Monday to Saturday, so check the wording that applies to you.
Are public holidays deducted?
Both dates are included. The French calendar excludes 11 national holidays; add regional holidays and applicable closures. A weekly rest day is never subtracted twice. The French calendar covers 2000–2099. It does not decide whether a public holiday is a day off at your workplace: select no calendar and enter your exact list if needed, including for Whit Monday. Use custom dates for other countries. Exclusions apply to both counting and shifting, including across New Year.
Are the start and end dates included?
Yes, both are counted if they are working days: Monday to Friday of the same week is 5 business days. For the shift, however, the start date itself is not counted.
How do I add business days to a date?
Enter the starting date as the start date, then the number of days in the shift field. If the starting date is a Saturday, + 1 business day gives the Monday.
How many working days are there in a year?
Between 260 and 262 Monday-to-Friday days depending on the year, before public holidays. 2026 has 261, because it starts on a Thursday and has 52 weeks plus one extra Thursday.
What if I do not work Monday to Friday?
Choose Monday–Saturday for a six-day week or Sunday–Thursday for a Friday–Saturday weekend, as in several Gulf countries. For other patterns, count the calendar days and subtract your own rest days.
Are Alsace-Moselle holidays included?
No. The French calendar only includes the 11 national holidays. In Alsace-Moselle, add Good Friday and 26 December as custom dates, for example 2026-04-03, 2026-12-26.
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