Business Days & Workday Calc

Workdays, holidays, SLA & PTO. People also call this OpenKrill Business Days, Business Days and Holidays, Workday Calculator, Bank Holiday Calendar. The tool names below are unchanged, so an existing client keeps working.

Count workdays, office days and PTO days between two dates, add business days for an SLA due date, or list bank holidays and school breaks. Ask "how many working days are there between 14 July and 18 August in Germany?", "what date is 37 business days after 11 August in England?", "is Monday a bank holiday in Bavaria?" or "what are the school holidays in Bavaria?".

Business Days and Workday Calculator does the date arithmetic exactly and reads each country's public holidays from Nager.Date, with school holidays from OpenHolidays, so the result does not depend on a guess about which days are holidays. People also call it OpenKrill Business Days. It does not count trading days, banking days, or settlement days.

It says how it counted. A working day is any day that is not a weekend day (Saturday and Sunday unless you set another weekend) and not a public holiday of the country or region. When you add days, the start date is day 0 and is not counted; when you count a range, both ends are counted unless you say otherwise. Bank holidays that are not days off, optional days and half days such as Christmas Eve count as working days.

Add a region (for example DE-BY, GB-SCT or US-CA) to include that region's holidays. Without one, holidays that only some regions keep are not counted, and the answer lists them so you can see the difference.

It covers more than 200 countries and territories for public holidays and a smaller set, mostly in Europe, for school holidays. It moves up to 1000 business days at a time and reads up to eight calendar years in one question. Company closures, local observances and legal deadline rules are not included, so check the official calendar and the contract before relying on a date.

It stores nothing about you: answers are cached for up to 24 hours, and the only lasting record is a daily count of calls per tool.

Tools

• count_business_days: Count working days, workdays and PTO
• add_business_days: Calculate a business-day due date and SLA
• list_holidays: List bank holidays and school breaks

2026 country calendars

Each page below is one tools/call result: the holiday table, the business-day count for the year, and a 10 business-day turnaround from 2 March 2026. They are not copies of this page.

• Germany 2026: 254 business days, 19 listed public holidays.
• England 2026: 253 business days, 8 listed public holidays.
• United States 2026: 251 business days, 17 listed public holidays.
• France 2026: 252 business days, 11 listed public holidays.
• Vietnam 2026: 257 business days, 4 listed public holidays.
• Ontario, Canada 2026: 251 business days, 11 listed public holidays.

The server is https://businessdays.openkrill.app/mcp and needs no key. Install steps: ChatGPT, Claude, Cursor, Pi.