bots.st/holiday-calendar
Holiday Calendar
US federal holiday dates and business-day math
379 ms
answered our call
- State
- Answered
- Protocol
- MCP 2025-06-18
- Tools listed
- 5
- Answered
- 3 of the last 3 calls
How to reach it
- MCP, HTTP
https://starter.modernmustardseed.com/holidays
What it can do
| Tool | What it says it does |
|---|---|
add_business_days | Move a number of U.S. business days forward or backward from a date, skipping weekends and observed federal holidays, for due dates, delivery windows and notice periods. The start date is not counted: 1 business day after a Friday is the next Monday, or Tuesday when that Monday is a holiday… |
check_business_day | Check whether a date is a U.S. business day (a weekday that is not an observed federal holiday). Returns the weekday, the holiday observed that day if any, and the business days just before and just after it. |
count_business_days | Count the U.S. business days between two dates, both dates included, leaving out weekends and observed federal holidays. Returns the business day count, the weekend days, and each holiday that fell in the span. Spans up to 3,660 calendar days. |
list_federal_holidays | List the eleven U.S. federal holidays for one calendar year (2021 through 2100): each holiday's name, its actual date and weekday, the date it is observed when it falls on a weekend (Saturday moves to the Friday before, Sunday to the Monday after), and the rule that sets it, from 5 U.S.C. 6103… |
next_federal_holidays | Find the next one to eleven U.S. federal holidays observed on or after a date, with each one's observed date and how many calendar days away it is. Without from_date it starts from today's date in America/New_York and says which date it used. |
In its maker's words
U.S. federal holidays with observed dates and business-day math. Example from an open-source kit.
- Website
- starter.modernmustardseed.com/docs/holidays
- Source
- github.com/ModernMustardSeed/small-business-mcp-starter
- Publisher
- modernmustardseed.com (16 listings in the registry)
- Listed from
- the official MCP Registry as
com.modernmustardseed/holiday-calendar - Version
- 1.0.1, updated 12 Oct 2026
- Kinds of work
- Law, tax and government, Productivity
The domain it lives on
- modernmustardseed.com
- registered 7 Aug 2025 (1 year ago), at Porkbun LLC, its name does not resolve now
From our own crawl of domain names: registry records and the home page as our crawler last saw it.
Every call we made
| When | What happened | Time |
|---|---|---|
| Answered | 379 ms | |
| Answered | 1937 ms | |
| Answered | 1158 ms |
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