@appmonster/mcp-world-calendar

MCP server for public holidays and business-day math in 200+ countries and regions: is it a working day, add N business days, count working days, local weekends (Fri–Sat etc.). No keys, offline.

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Version: 0.1.0

Version published: 18 hours ago

Maintainers: 1

Created: 18 hours ago

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World Business Calendar MCP

Agents get dates wrong. This server answers "is it a working day there?" and "what date is 5 business days from now?" for 200+ countries and their states/regions, with local weekends (Friday–Saturday in Saudi Arabia, Israel, Egypt; Friday in Iran) and observed/substitute holidays. Offline, no API keys.

npx -y @appmonster/mcp-world-calendar

Hosted (no install): https://okagent.kr/api/mcp (Streamable HTTP) — or REST https://okagent.kr/api/tools.

Tool	What it does
`world_list_holidays`	Holidays of a country/region for a year (English + local names, public/bank/optional)
`world_is_business_day`	Working day or not, next/previous working day (default: today in that country)
`world_add_business_days`	Add/subtract N working days, or count working days between two dates
`world_common_business_days`	Dates that are working days in all of several countries (cross-border meetings, settlements)
`world_list_countries`	Supported country and region codes

Claude Desktop config:

{ "mcpServers": { "world-calendar": { "command": "npx", "args": ["-y", "@appmonster/mcp-world-calendar"] } } }

Data: date-holidays (ISC code, holiday data CC-BY-3.0, © commenthol and contributors). Korea uses the K-MCP Korean engine (includes 2026 changes). Part of K-MCP. MIT.