Date Math / Tools / date_add

Add business days to a date

Add or subtract years/months/weeks/days/business days/hours/minutes/seconds from a date. Month-end clamping; business days skip weekends, given holidays, and the public holidays of an optional country. Use for due dates, deadlines, delivery estimates, expiry and "N working days from today".

MCP tool date_addHTTP POST /v1/add25 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.

date_add

result

{
  "input": "2026-12-22",
  "result": "2026-12-31",
  "weekday": "Thursday",
  "is_business_day": true
}

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 date_add 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/add \
  -H "Content-Type: application/json" \
  -d '{"date":"2026-12-22","business_days":5,"country":"PH"}'

Full schema: OpenAPI · llms.txt