World Business Calendar runs on your own machine — the client starts it, so there is no endpoint to ping. Last commit 24 Oct 2026.
Public holidays and working-day math for 200+ countries and regions, local weekends. No keys.
Today is the operative word: we check World Business Calendar every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.
This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.
claude mcp add mcp-world-calendar -- npx -y @appmonster/mcp-world-calendar
{
"mcpServers": {
"mcp-world-calendar": {
"command": "npx",
"args": [
"-y",
"@appmonster/mcp-world-calendar"
]
}
}
}
[mcp_servers.mcp-world-calendar]
command = "npx"
args = ["-y", "@appmonster/mcp-world-calendar"]
{
"mcpServers": {
"mcp-world-calendar": {
"command": "npx",
"args": [
"-y",
"@appmonster/mcp-world-calendar"
]
}
}
}
{
"servers": {
"mcp-world-calendar": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"@appmonster/mcp-world-calendar"
]
}
}
}
Public holidays, business days and long weekends for Japan (Cabinet Office) and 245 other countries.
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Answers built from our own checks of this server.