Business Day Calculator
Date maths that respects real public holidays: business days between dates, deadlines, SLAs and working days shared by several countries.
Business Day Calculator counts and adds working days using the public holidays of a country or region, weekends that you choose, and your own closure days. It uses the public Nager.Date holiday data set, so state and regional holidays (for example US-CA, DE-BY or AU-NSW) are supported where that data set has them.
It answers questions such as how many business days lie between two dates, what date is 15 business days after an order, the next business day after a date, which holidays a country has in a year, and which days in a month are working days in several countries at once. Weekend days (for example Friday and Saturday) and company closure days can be saved to the account as a calendar.
If the holiday source cannot be reached and nothing is cached, the tool reports that instead of calculating without holidays.
Example prompts
Add it to Claude
- In Claude, open Settings, then Connectors, then Add custom connector.
- Enter the URL
https://workdays.tidybutton.com/mcpand save. - Choose Connect. A sign-in page asks for your email address and sends a six digit code. No password is needed.
Plans
Free
- 100 calculations per month
- 1 saved calendar
- All countries and regions in the holiday data set
Pro
- 10,000 calculations per month
- Up to 10 saved calendars
Details on the pricing page.