US Federal Holidays and Business Days MCP Server

by theluckystrike Your server? Claim it

answering

US Federal Holidays and Business Days is answering right now. Last checked 1 min ago. It exposes 5 tools. Last commit 2 Nov 2026.

Exact U.S. federal holidays and business days 1971-2100, OPM and Federal Reserve observance.

Uptime history 13 days of history

13 days agonow

100.0%

Uptime 24h

92 of 92 checks

Tools

read from the server

224 ms

Response time

average over 24h

Stars

last commit 2 Nov 2026

Nothing serious here today

Today is the operative word: we check US Federal Holidays and Business Days every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 1 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add us-federal-holidays-business-days-mcp --transport http https://us-federal-holidays-business-days-mcp.lipmichal.workers.dev/mcp

Settings → Connectors → Add custom connector, then paste this address

https://us-federal-holidays-business-days-mcp.lipmichal.workers.dev/mcp

~/.codex/config.toml

[mcp_servers.us-federal-holidays-business-days-mcp]
url = "https://us-federal-holidays-business-days-mcp.lipmichal.workers.dev/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "us-federal-holidays-business-days-mcp": {
      "url": "https://us-federal-holidays-business-days-mcp.lipmichal.workers.dev/mcp"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "us-federal-holidays-business-days-mcp": {
      "type": "http",
      "url": "https://us-federal-holidays-business-days-mcp.lipmichal.workers.dev/mcp"
    }
  }
}

Available tools 5

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

business

add_business_days

Adds (or with a negative number subtracts) N business days to a date, skipping weekends and observed U.S. federal or Federal Reserve holidays exactly. The start date is not counted. With 0, returns the start date if it is a business day, otherwise the next one. Lists every holiday skipped.

is_business_day

Says whether a date (1971-2100) is a business day on the U.S. federal (OPM) calendar or the Federal Reserve banking calendar, names the holiday if any, and returns the previous and next business day. The two calendars differ when a holiday falls on Saturday: 2026-07-03 is a federal holiday but a Fed banking day.

count

count_business_days

Counts business days between two dates (1971-2100) on the U.S. federal or Federal Reserve calendar, excluding weekends and observed holidays. include_start and include_end default to true, like Excel NETWORKDAYS. If end is before start the count is negative. Lists the weekday holidays that were excluded.

federal

list_federal_holidays

Exact U.S. federal holidays for any year 1971-2100 under 5 U.S.C. 6103: legal date, OPM observed date (Saturday -> Friday, Sunday -> Monday, so New Year's Day 2022 is observed Friday 2021-12-31) and the Federal Reserve closure date (Fed Banks stay OPEN the Friday before a Saturday holiday). Applies the rule history a model tends to get wrong: Juneteenth from 2021, MLK Day from 1986, Veterans Day on the 4th Monday of October 1971-1977, and Inauguration Day (DC area only, flagged optional). No network calls.

invoice

invoice_due_date

Computes an invoice due date from an issue date and net terms in calendar days (Net 30 = 30), then optionally rolls a weekend or U.S. holiday due date: following (next business day), preceding, or modified_following (next business day unless it crosses into the next month). Uses exact observed federal or Federal Reserve holidays.

Endpoints

URL	Transport	State	Latency	Checked
https://us-federal-holidays-business-days-mcp.lipmichal.workers.dev/mcp	streamable-http	answering	375 ms	1 min ago

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US Federal Holidays and Business Days — questions

Answers built from our own checks of this server.

What can US Federal Holidays and Business Days do?

It exposes 5 tools, read directly from the server on our last check. Among them: add_business_days, count_business_days, invoice_due_date, is_business_day, list_federal_holidays. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is US Federal Holidays and Business Days working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 224 ms. The bar chart above shows every period we have measured.

How do I connect US Federal Holidays and Business Days?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does US Federal Holidays and Business Days need an API key?

No. US Federal Holidays and Business Days completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 5 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is US Federal Holidays and Business Days?

It answers our handshake in 224 ms on average, which is faster than 60% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is US Federal Holidays and Business Days open source?

The code is open source: it is published under the MIT licence, written in TypeScript and 0 stars on GitHub. The licence covers the code in the repository, not the hosted service at us-federal-holidays-business-days-mcp.lipmichal.workers.dev, which runs on its operator's own terms.