Managing deadlines, planning projects, or simply calculating the time between two events goes far beyond counting the days on the calendar. It is essential to know the exact number of business days — those that exclude weekends and national holidays.
The Business Days Calculator in Japan was created to provide an accurate and automatic count of business days between two dates, saving time and avoiding manual errors.
Whether you are an HR professional, student, accountant, or anyone who deals with deadlines on a daily basis in Japan, this tool is made for you.
How the Business Days Calculator Works (Step by step)
See how to use the Business Days Calculator:
Select the country:
At the top of the page, choose Country from the menu. The calculator will automatically load the national and regional holidays of the selected country.Choose the type of calculation:
By default, the option “Business Days Calculator” will be selected, to show the number of business days between two dates.Enter the start and end date:
Type in the desired start date.
Type in the end date.
You can use the date picker for convenience.
Calculate:
Click the “Calculate Business Days” button.
In moments, you will see:Start Date and End Date
Total days in the period
Business Days (excluding weekends and holidays)
Weekends present in the range
Holidays that fall between the selected dates
Detailed list of the considered holidays
Example:
If you want to know how many business days there are between March 1, 2025, and March 31, 2025, just enter those dates and let the calculator do the rest!
What are considered business days in Japan?
In most countries, business days are from Monday to Friday, excluding Saturdays, Sundays, and holidays.
In some regions, local customs may define different workweeks (e.g., from Sunday to Thursday in Middle Eastern countries). Our calculator adapts to the pattern of each country.
National holidays — such as commemorative dates, religious holidays, or official days off — are automatically excluded according to the official calendar of each country.
You do not need to worry about manually adjusting holidays: the calculator is updated every year for each country.
Why use a Business Days Calculator?
Accurate project management:
Know exactly how much time you have for deliveries, bids, or tests, without overestimating deadlines.Legal and financial deadlines:
Many contracts, payments, and judicial deadlines are defined in business days, not calendar days.Payroll and HR:
Accurately calculate worked days, absences, vacations, and other rights.Personal planning:
Organize trips, moves, or appointments considering only the days that really count.
Practical examples
1. How many business days are there in a month?
“How many business days are there in June 2025 in Japan?”
Just enter Start Date: 01/06/2025, End Date: 30/06/2025, select the country, and click Calculate Business Days.
You will see exactly how many business days, weekends, and holidays exist in the period.
2. Project deadline example
“If a project starts on March 15 and ends on April 10, how many business days do I have to complete it?”
Enter the dates to see the actual business days, considering all holidays and weekends.
3. Comparing countries
“How does the count of business days in Japan compare to other countries?”
Change the country in the selector to compare the number of business days in the same period in different regions.
List of national holidays in Japan
The calculator automatically excludes all national holidays in Japan for the selected year.
You will also see a detailed list of the holidays occurring in the chosen interval.
See all holidays in Japan in 2025:Holidays Calendar
