النسخة العربية: كيفية حساب أيام العمل بين تاريخين والعطلات الرسمية
Counting the days between two dates is easy until weekends, public holidays, and different workweek rules enter the calculation. The difference between calendar days and actual working days can affect leave balances, project schedules, contract deadlines, payroll reviews, and service commitments.
This guide explains how to calculate working days accurately, select the right weekend, and handle a public holiday that overlaps with a weekend.
What are working days?
Working days, also called business days, are the days within a period after non-working weekend days and applicable public holidays have been excluded.
Working days = calendar days − weekend days − public holidays
The formula is simple, but manual counting becomes inconvenient across long periods or regions with different weekends and holiday calendars.
A faster way to calculate business days
Manarty’s free Working Days Calculator counts the actual workdays between a start and end date. You can use a Friday–Saturday weekend, a Saturday–Sunday weekend, no weekend, or a custom combination of weekdays.
The tool also accepts public-holiday dates and shows a breakdown of calendar days, working days, weekend days, holidays, and full weeks. It works in a browser on mobile and desktop.
How to use the Working Days Calculator
- Enter the start date. Select the first day included in the period.
- Enter the end date. Select the final day included in the period.
- Configure the weekend. Choose the preset or custom days used by your organisation.
- Add public holidays. Enter one date per line in YYYY-MM-DD format.
- Review the breakdown. Confirm the working-day total and each excluded category.
Are the start and end dates included?
The calculator includes both the first and last dates. A leave period from Monday through Friday therefore contains five days when all five are working days.
This inclusive approach is common for leave calculations. A simple subtraction between two date values may return four because it measures the elapsed interval rather than counting both named dates. Always confirm the rule required by your employer, contract, or local procedure.
How to choose the correct weekend
Weekend rules vary between countries, organisations, and job types. Many international workplaces use Saturday and Sunday, while a Friday–Saturday weekend is common in parts of the Gulf. Retail, healthcare, hospitality, and shift-based operations may use other schedules.
Select the days that actually apply to the person or team being measured. A default international weekend can produce an incorrect result for a regional office or a custom work roster.
How to exclude public holidays
Enter each holiday on a separate line using the YYYY-MM-DD format. A holiday that falls on a normal workday is removed from the working-day total. If it falls on a selected weekend day, it is classified once and is not deducted twice.
Use an official, current calendar for the relevant location. Holiday dates may change from year to year, especially when they follow a lunar calendar or depend on a government announcement.
Common uses for a business-day calculation
Employee leave
Employees and HR teams can estimate the workdays contained in a leave request after weekends and listed holidays are excluded. The final deduction still depends on company policy and the leave type.
Project planning
Project managers can build realistic delivery schedules using days when the team is available instead of calendar days that include closures.
Contract deadlines
Agreements often require action “within 10 business days.” The parties should identify the starting event, governing holiday calendar, weekend definition, and whether the first day is included.
Service-level tracking
Support and operations teams can measure response windows more consistently when non-working days are excluded under an agreed service calendar.
A practical example
Imagine a project period running from 1 August through 15 August. The inclusive period contains 15 calendar days. If four days are selected weekend days and one public holiday falls on a normal workday, the result is:
15 − 4 − 1 = 10 working days
If that public holiday falls on one of the four weekend days, it should not be subtracted again. The period then contains 11 working days.
Working days versus calendar days
Calendar days include every date in the period. Working days exclude the days defined as non-working. The distinction matters whenever a policy, contract, or deadline uses one term rather than the other.
For example, “seven calendar days” continues through a weekend. “Seven working days” pauses on the configured weekend and any recognised holiday. Never replace one measurement with the other without checking the original wording.
Common mistakes to avoid
- Leaving out the final date when an inclusive count is required.
- Using Saturday–Sunday for a team with a different weekend.
- Deducting a public holiday twice when it overlaps a weekend.
- Using an outdated or wrong regional holiday list.
- Confusing working days with calendar days in a contract.
- Ignoring shift patterns, part-time schedules, or substitute holidays.
Frequently asked questions
Does the calculator support a Friday–Saturday weekend?
Yes. Choose Friday and Saturday as the weekend, or use another custom combination.
What happens when a holiday falls on a weekend?
The date is treated as one non-working day and is not removed twice from the total.
Can I use the result for annual leave?
The result provides the number of configured workdays in the period. The actual leave deduction depends on employment rules, company policy, and the leave category.
Can I select only one weekend day?
Yes. The custom weekend controls allow any single day or combination of days.
Are substitute holidays added automatically?
No. Add the observed or substitute date manually when it is recognised by the relevant organisation or authority.
Final takeaway
An accurate working-day calculation needs more than two dates. Confirm whether the count is inclusive, select the correct weekend, add current public holidays, and check the governing policy. This process produces a useful planning result while keeping regional and organisational differences visible.