Japan Business Calendar

Japanese business days, holiday checks and invoice due dates for your AI agent.

For payroll, accounting and SaaS teams shipping to Japan. Free: next holidays. Pro: business-day maths.

Tools

• next_holidays (free) — FREE. Next 3 Japanese public holidays and whether today is a business day.
• business_days (Pro) — PRO. Add/subtract N Japanese business days from a date.
• due_date (Pro) — PRO. Invoice due date: start + N calendar or business days.
• year_planner (Pro) — PRO. Full holiday list from the dataset.

Live free example

next_holidays {}

{
  "today": "2026-10-16",
  "business_day": true,
  "holiday_today": null,
  "next_3": [
    {
      "date": "2026-11-03",
      "name": "文化の日"
    },
    {
      "date": "2026-11-23",
      "name": "勤労感謝の日"
    },
    {
      "date": "2027-01-01",
      "name": "元日"
    }
  ],
  "pro": "Business-day add, due dates, year planner: https://jp-business-calendar-mcp.donniertf.workers.dev/buy",
  "disclaimer": "Business-day maths using Japanese national holidays (holidays-jp). Does not include company-specific or bank half-days."
}

Connect (MCP)

Add https://jp-business-calendar-mcp.donniertf.workers.dev/mcp to Claude, Cursor or any MCP client (Streamable HTTP, no login for the free tier). Subscribers pass access_token or Authorization: Bearer.

Important

Business-day maths using Japanese national holidays (holidays-jp). Does not include company-specific or bank half-days.

Data sources & licences

• holidays-jp API based on Cabinet Office schedules

For AI agents

llms.txt · server card · pricing.json · POST /checkout → checkout URL · GET /token?session_id= → access token.

More Japan data MCPs

Save with Japan bundles: jp-mcp-bundles · GitHub hub.

Contact & cancelling

Questions, refunds or cancelling: dmorrisonwebdesign@gmail.com. Run by Donnie Morrison, UK. Payments by Stripe; we never see card details.