US Federal Holidays and Business Days
Calculate business days, invoice due dates, and holiday observances on U.S. federal and banking calendars.
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.
Try asking Muse: "Calculate when an invoice with Net 30 terms issued on Friday before a holiday weekend is actually due."
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Source: Found in the official MCP Registry (io.github.theluckystrike/us-federal-holidays-business-days-mcp) · First listed October 30, 2026
Last 24 hours
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How to add it to Muse
Not in Muse's Connectors list yet, but Muse can still use it. Copy the request below and paste it into Muse. 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.
https://us-federal-holidays-business-days-mcp.lipmichal.workers.dev/mcpNot in Muse's Connectors list yet. Muse can still use it: its page gives you a request to paste into Muse.
Also use it in ChatGPT or Claude
US Federal Holidays and Business Days is a remote MCP server, so any assistant that can add a custom connector by link can use it. Same link, same tools.
Add it to ChatGPT
- 1
Open ChatGPT settings
In ChatGPT, open Settings, then Connectors (called Apps & Connectors on some accounts).
- 2
Turn on developer mode
Under Advanced settings, switch on Developer mode. That is what lets you add a connector by link.
- 3
Create the connector
Choose Create, give it a name, paste the link as the MCP server URL, and save. If it needs a sign-in, ChatGPT asks for it here.
- 4
Use it in a chat
Start a chat, open the tools menu, pick the connector, and ask. ChatGPT asks before it runs a tool the first time.
Custom connectors need a paid ChatGPT plan, and on Team, Enterprise and Edu accounts only an admin can add them. Our "Working" label means the server answered us; it cannot tell whether your plan lets you add it. All connectors that work in ChatGPT
Add it to Claude
- 1
Open Claude settings
In Claude, open Settings, then Connectors.
- 2
Add a custom connector
Choose Add custom connector, give it a name, and paste the link.
- 3
Connect and use it
If it needs a sign-in, Claude sends you to it. Then turn the connector on in a chat from the tools menu and ask.
Custom connectors are available on paid Claude plans; on Team and Enterprise accounts an admin may need to add them. Our "Working" label means the server answered us; it cannot tell whether your plan lets you add it. All connectors that work in Claude
https://us-federal-holidays-business-days-mcp.lipmichal.workers.dev/mcpWhat people ask Muse to do
Technical details: safety screening, tools, response time and recent checks
Response time at the last check: 182ms. Worked in n/a of checks over 30 days.
Screening · October 30, 2026
Screened, no issues found
Screening looks for known threats and hidden instructions at the time of the check, and runs again weekly and whenever the tool list changes. It cannot see the server's code, so only connect what you need and review what Muse asks to do. How screening works.
Tools · 5
list_federal_holidaysExact 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 Saturdais_business_daySays 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 federadd_business_daysAdds (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 holidacount_business_daysCounts 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 holinvoice_due_dateComputes 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 Link
https://us-federal-holidays-business-days-mcp.lipmichal.workers.dev/mcpQuestions about US Federal Holidays and Business Days in Muse
How do I connect US Federal Holidays and Business Days to Muse?
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.
Is US Federal Holidays and Business Days working right now?
At the last check (October 30, 2026, 06:36 UTC) the endpoint was working, answering in 182ms. It is checked every 15 minutes.
Is US Federal Holidays and Business Days safe to connect to Muse?
It was screened on October 30, 2026 with the result "screened, no issues found". Screening checks the domain against threat feeds and reads the tools for hidden instructions and requests for passwords or card numbers. It cannot see the server's code, so grant only the access you need.
What can US Federal Holidays and Business Days do in Muse?
It exposes 5 tools, including list_federal_holidays, is_business_day, add_business_days, count_business_days. For example, you could ask Muse: "Calculate when an invoice with Net 30 terms issued on Friday before a holiday weekend is actually due."
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