# Business Day Calendars MCP server

NYSE, Federal Reserve, TARGET2 and UK business days, holidays and T+N settlement dates.

## At a glance

Business Day Calendars is an MCP server in the Legal & Government category. It is hosted remotely and connects over HTTP, and declares no required credentials. It exposes 6 tools, including is_business_day, add_business_days and settlement_date. It scores D (33/100) on the MCP Skills Hub health score as of Oct 28, 2026.

## Install

### How to install Business Day Calendars in Claude Code

1. Add the server

```bash
claude mcp add --transport http business-days https://business-days.quietworklabs.workers.dev/mcp
```

2. Verify it's connected

```bash
claude mcp list
```

3. Sharing it with your team?

   Add `--scope project` to write it to .mcp.json in the repository root, which you can commit (with the secrets left as environment variables).

4. Use it in a session

   Ask Claude to use the tools this server exposes (e.g. is_business_day, add_business_days, settlement_date). It discovers them automatically.

### How to install Business Day Calendars in Claude Desktop

1. Open your MCP config

   macOS: ~/Library/Application Support/Claude/claude_desktop_config.json · Windows: %APPDATA%\Claude\claude_desktop_config.json

2. Add this server

```json
{
  "mcpServers": {
    "business-days": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-remote",
        "https://business-days.quietworklabs.workers.dev/mcp"
      ]
    }
  }
}
```

3. Why the wrapper?

   This is a remote (HTTP) server and Claude Desktop only launches local processes, so mcp-remote proxies the connection. It will open a browser window if the server needs OAuth.

4. Restart Claude Desktop

   The tools appear under the 🔌 menu once the app reloads.

### How to install Business Day Calendars in Cursor

1. Create / edit .cursor/mcp.json in your project

```json
{
  "mcpServers": {
    "business-days": {
      "url": "https://business-days.quietworklabs.workers.dev/mcp"
    }
  }
}
```

2. Enable it

   Cursor Settings → MCP → toggle the server on. Tools become available to the Composer/Agent.

### How to install Business Day Calendars in Codex CLI

1. Add to ~/.codex/config.toml

```toml
[mcp_servers.business-days]
command = "npx"
args = ["-y", "mcp-remote", "https://business-days.quietworklabs.workers.dev/mcp"]
```

2. Why the wrapper?

   Codex runs MCP servers as local processes, so mcp-remote bridges this HTTP endpoint to stdio.

3. Run Codex

   Codex loads MCP servers from config.toml on startup and exposes their tools to the agent.

### How to install Business Day Calendars in Windsurf

1. Edit ~/.codeium/windsurf/mcp_config.json

```json
{
  "mcpServers": {
    "business-days": {
      "serverUrl": "https://business-days.quietworklabs.workers.dev/mcp"
    }
  }
}
```

2. Reload

   Windsurf → Cascade → refresh MCP servers. Cascade can now call the tools.

### How to install Business Day Calendars in Cline

1. Open Cline → MCP Servers → Configure

   Adds to cline_mcp_settings.json.

2. Add the server

```json
{
  "mcpServers": {
    "business-days": {
      "type": "streamableHttp",
      "url": "https://business-days.quietworklabs.workers.dev/mcp"
    }
  }
}
```

### How to install Business Day Calendars in VS Code

1. Create .vscode/mcp.json

```json
{
  "servers": {
    "business-days": {
      "type": "http",
      "url": "https://business-days.quietworklabs.workers.dev/mcp"
    }
  }
}
```

2. Start it

   VS Code shows a ▶ Start action above the server entry. Agent mode (Copilot Chat) can then use the tools.

## Tools

- `is_business_day` — Whether a date is a business day on one or more settlement calendars (NYSE, Fedwire/FedACH, TARGET2, UK), which holiday closes it, NYSE early closes, and the previous/next business day. Deterministic, no AI. Price: $0.001 USDC per call via x402 (Base); the first 5 calls per day per client are free.
- `add_business_days` — Adds (or with negative days subtracts) N business days to a date on a joint calendar (NYSE, Fedwire/FedACH, TARGET2, UK) and lists the holidays skipped. Deterministic, no AI. Price: $0.001 USDC per call via x402 (Base); the first 5 calls per day per client are free.
- `settlement_date` — Settlement date T+N for a trade date on a joint calendar. Default XNYS,FED with t=1 (US equities since 28 May 2024). If the trade date is not a business day it is first rolled to the next one. Deterministic, no AI. Price: $0.001 USDC per call via x402 (Base); the first 5 calls per day per client are free.
- `business_days_between` — Counts business days between two dates on a joint calendar: days after start up to and including end (inclusive=true also counts start). Negative if end is before start. Lists weekday holidays in range. Max 10 years. Deterministic, no AI. Price: $0.001 USDC per call via x402 (Base); the first 5 calls per day per client are free.
- `adjust_date` — Rolls a date that falls on a weekend or holiday using a business-day convention: following, modified_following, preceding, modified_preceding. Typical for payment, coupon and invoice due dates. Deterministic, no AI. Price: $0.001 USDC per call via x402 (Base); the first 5 calls per day per client are free.
- `list_holidays` — Lists closing days for one calendar and year (2000-2099): NYSE full closures and 1 pm early closes, Federal Reserve (Fedwire/FedACH) holidays with Saturday/Sunday observance rules, TARGET2 closing days, UK England & Wales bank holidays with substitute days. Weekend-only holidays with no weekday closure are omitted. Deterministic, no AI. Price: $0.001 USDC per call via x402 (Base); the first 5 call

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Source: https://mcp-skills-hub.vercel.app/mcps/dev-workers-quietworklabs-business-days-business-days · MCP Skills Hub · data as of 2026-10-28T12:31:05Z