Date Math / Tools / business_day

Is it a business day?

Is a date a business day? If not, why (weekend, or which public holiday). Also the next and previous business day, and the month's business-day count, first and last business day. Use for office-open checks, shipping cut-offs, settlement dates. Country holidays, custom holidays and custom workweeks (e.g. Sun–Thu, Mon–Sat).

MCP tool business_dayHTTP POST /v1/business_day25 free calls a day, then $0.001

Try it

Runs the real tool over MCP. Edit the arguments and run. Uses your daily free calls.

business_day

result

{
  "date": "2026-12-25",
  "weekday": "Friday",
  "is_business_day": false,
  "reason": "holiday",
  "holiday": "Christmas Day",
  "next_business_day": "2026-12-28",
  "previous_business_day": "2026-12-24",
  "month": {
    "business_days": 21,
    "first_business_day": "2026-12-01",
    "last_business_day": "2026-12-31",
    "business_day_number": null
  }
}

The result shown before you run is a saved example response.

Use it from your agent

Add the MCP server once and your agent can call business_day and the other 19 tools.

Claude Code

One command in your terminal.

claude mcp add --transport http date-math https://date-math.datemath.workers.dev/mcp

Any MCP client

Claude Desktop, Cursor, VS Code, Windsurf.

{
  "mcpServers": {
    "date-math": {
      "url": "https://date-math.datemath.workers.dev/mcp"
    }
  }
}

HTTP + x402

POST JSON; pay the 402 with any x402 client.

curl -X POST https://date-math.datemath.workers.dev/v1/business_day \
  -H "Content-Type: application/json" \
  -d '{"date":"2026-12-25","country":"PH"}'

Full schema: OpenAPI · llms.txt