Business days & deadlines
Calculate business days with confidence.
Calculate a date after or before a number of business days, or count business days in a range using weekends, 2026 Japanese holidays, and your custom holidays.
Calculate business days
business days after
The start date is not counted. Counting begins on the following date, and the result must stay within 2026.
business days before
The deadline is not counted. Counting begins on the previous date, and the result must stay within 2026.
Both the start and end dates are included in the count.
Custom holidays (2026)
Add company holidays, school closures, or temporary days off.
Saving happens only when you press a button. Data stays in this browser and is not sent to a server or included in a URL.
Holiday profiles
Name and save holiday sets for a company, project, or school (up to 3).
Saved only in this browser.
Calculation result——
Excluded-date calendar
Only the period used in the calculation is shown. Check the date and reason, not color alone.
Business dayWeekendJapanese holidayCustom holiday
View excluded dates and reasons
How dates are treated
- Saturdays, Sundays, and Japan's 2026 public holidays are excluded from business days.
- Add company holidays or temporary closures on screen, then save them only if you need them again.
- For date ranges, the result lists excluded dates and their reasons.
- Inputs are not sent to the URL, GTM/dataLayer, or server, and are not included in a share URL.
This is an estimate based on the selected holidays. It does not establish a contractual, legal, or counterparty deadline. Confirm important deadlines with the relevant organization. The preset holiday calendar is for Japan in 2026; there is no country selector.
Holiday source: Cabinet Office of Japan, “Public Holidays” (2026 preset)