# US Federal Holidays and Business Days Muse connector

From musedirectory.ai, the independent directory of Meta Muse connectors. Not affiliated with Meta.

## US Federal Holidays and Business Days

Calculate business days, invoice due dates, and holiday observances on U.S. federal and banking calendars.

- Record: https://musedirectory.ai/connector/us-federal-holidays-and-business-days
- Category: Finance & Bills
- Developer: theluckystrike (https://us-federal-holidays-business-days-mcp.lipmichal.workers.dev/)
- Muse status: Extra setup. Not in Muse's Connectors list yet. Muse can still use it: its page gives you a request to paste into Muse.
- Health: Working, 182ms, checked 2026-10-30T06:36:33Z
- Endpoint: https://us-federal-holidays-business-days-mcp.lipmichal.workers.dev/mcp
- Auth: No account needed; Pricing: unknown
- Screening: Screened, no issues found (2026-10-30T06:36:33Z)
- Source: Found in the official MCP Registry (io.github.theluckystrike/us-federal-holidays-business-days-mcp) https://registry.modelcontextprotocol.io/v0/servers?search=io.github.theluckystrike%2Fus-federal-holidays-business-days-mcp

Provides exact U.S. federal holidays (1971-2100) under OPM and Federal Reserve observance rules. Calculates whether dates are business days, adds or counts business days while skipping weekends and holidays, and computes invoice due dates with holiday-aware rolling.

Example request: "Calculate when an invoice with Net 30 terms issued on Friday before a holiday weekend is actually due."

How to connect: Not in Muse's Connectors list yet, but Muse can still use it. Paste this into Muse: "Use US Federal Holidays and Business Days to help me. It is a free service with an MCP server at https://us-federal-holidays-business-days-mcp.lipmichal.workers.dev/mcp. It does not need an API key. Ask me before you share anything with it." Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.

Tools:
- 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 Saturda
- 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 feder
- 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 holida
- 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 hol
- 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 

Screening checks:
- MCP handshake: pass (Answered in 182ms)
- Domain against threat feeds (Cloudflare security DNS): pass (us-federal-holidays-business-days-mcp.lipmichal.workers.dev not flagged)
- Published packages against the OSV malicious-package database: n/a (No npm or PyPI package published)
- Hidden instructions or invisible characters in tool text: pass (5 tools read, nothing found)
- Inputs asking for passwords, card numbers or seed phrases: pass (None found)
- Domain and redirects: pass (No redirects off the domain)
- AI review of purpose and tool behavior: pass (No concerns)