Does this accurately reflect Japan's public holidays?

Yes. The engine uses strict Japanese holiday logic, accommodating vernal/autumnal equinox dynamics, multi-day substitute holidays, and National Holidays automatically.

Is the start date counted as Day 1?

By default, the tool operates on an 'exclusive' basis where the day after the start date is Day 1, which is a standard business practice.

How do I add my company's unique winter break to the calculation?

By checking 'Add Custom Company Holidays' and entering the dates in the text area, you can exclude them from the calculation results.

Can I calculate for a 6-day workweek?

Yes. In the exclusion settings panel, uncheck Saturday or Sunday as needed. The calculator will treat them as normal working days instead of days off.

Is it possible to count backward (e.g., 5 business days ago)?

Yes, it is possible. By selecting the 'X Business Days Before' tab, you can accurately calculate the date retrospectively from the base date.

What is the difference between "Total Days" and "Business Days"?

Total Days means absolute calendar days passed. Business Days counts only your working dates, excluding any defined holidays and weekends.

📅

business day calc,

Gratis Werkdagencalculator

Bereken direct X werkdagen na/voor een datum, of tel het aantal werkdagen tussen datums. Gratis & Geen Registratie.
Ondersteunt alle 16 Japanse nationale feestdagen met automatische detectie.

📱️

Japan Holidays

All 16 holidays auto-detected

⚡️

3 Modes

After, Before, and Count

Cultural Note

This tool is based on Japanese cultural, taxation, or market standards. Calculations and terminology may not directly apply outside of Japan.

Bereken X werkdagen na/voor een datum direct. Inclusief alle 16 Japanse nationale feestdagen (Happy Monday, vervangende feestdagen) met automatische detectie. Ondersteunt het uitsluiten van Obon/Nieuwjaar en aangepaste bedrijfsfeestdagen.

Startdatum

Werkdagen

dagen

Uitsluitingsinstellingen (Behandel als feestdag)

Zaterdag Zondag Nationale Feestdagen

Obon (13–16 aug) Nieuwjaar (29 dec–3 jan)

Voeg aangepaste bedrijfsfeestdagen toe

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about,

Over

This is an online tool that calculates the number of business days from a specified date. Automatically takes Japanese holidays into account and counts business days excluding Saturdays, Sundays, and holidays.

Supports calculation of the number of business days between the start date and end date, and the calculation of the date ○ business days after the specified date. Ideal for delivery date management and schedule planning.

All processing is completed within the browser and no data is sent to the server.

how to,

Hoe te gebruiken

STEP 1

Set start date

Select a base (start) date from the calendar or press the Today button.

STEP 2

Enter the number of business days

Input the number of business days you want to calculate (or specify an end date in "Count" mode) and adjust your exclusion settings if necessary.

STEP 3

Check results

The number of business days and applicable dates are displayed. You can also see details about holidays and business closures.

glossary,

Glossary

Business Day: A working day when businesses are typically open. In Japan, this generally means Monday through Friday, excluding national holidays and special observances.
Non-business Day: Weekends, public holidays, and custom designated off-days (like company anniversaries or winter breaks) that are excluded from working day calculations.
National Holidays (Shukujitsu): Legally mandated public holidays in Japan. The tool automatically factors in dynamic dates, substitute holidays, and "Citizens' Holidays."
Start Date: The date from which calculations begin. Knowing whether to include or exclude the start date ("Day 0" vs "Day 1") is critical for accurate deadlines.
Substitute Holiday (Furikae Kyujitsu): In Japan, if a national holiday falls on a Sunday, the immediate following working day becomes a statutory public holiday. The algorithm accounts for this.
Lead Time / Delivery Date: The amount of time required to fulfill a request, often expressed as "N business days." This tool translates that into an exact calendar date.
Custom Holidays: The ability to manually click and designate specific dates on the calendar (e.g., Year-end holidays from Dec 29 to Jan 3) to exclude them from the business day count.

faq,

FAQ

Q.Does this accurately reflect Japan's public holidays?: Yes. The engine uses strict Japanese holiday logic, accommodating vernal/autumnal equinox dynamics, multi-day substitute holidays, and National Holidays automatically.
Q.Is the start date counted as Day 1?: By default, the tool operates on an 'exclusive' basis where the day after the start date is Day 1, which is a standard business practice.
Q.How do I add my company's unique winter break to the calculation?: By checking 'Add Custom Company Holidays' and entering the dates in the text area, you can exclude them from the calculation results.
Q.Can I calculate for a 6-day workweek?: Yes. In the exclusion settings panel, uncheck Saturday or Sunday as needed. The calculator will treat them as normal working days instead of days off.
Q.Is it possible to count backward (e.g., 5 business days ago)?: Yes, it is possible. By selecting the 'X Business Days Before' tab, you can accurately calculate the date retrospectively from the base date.
Q.What is the difference between "Total Days" and "Business Days"?: Total Days means absolute calendar days passed. Business Days counts only your working dates, excluding any defined holidays and weekends.