Openworkdays
Zero-signup business-day date-math API: add days, count days between dates, is-business-day.
Connect it
Settings → Connectors → Add custom connector
URL: https://openworkdays.vercel.app/api/mcpSettings → Apps & Connectors → Advanced → Developer mode
Create connector with URL: https://openworkdays.vercel.app/api/mcp{
"mcpServers": {
"openworkdays": {
"url": "https://openworkdays.vercel.app/api/mcp"
}
}
}claude mcp add --transport http openworkdays https://openworkdays.vercel.app/api/mcp{
"servers": {
"openworkdays": {
"type": "http",
"url": "https://openworkdays.vercel.app/api/mcp"
}
}
}1 tools, verified live
businessdaysread-onlyBusiness-day date math. Three modes inferred from params: add (start+days -> the date N business days away, negative days = before), diff (start+end -> count of business days between, inclusive of both endpoints), is (date -> is it a business day). Optional weekend (default sat,sun) and holidays (comma list of YYYY-MM-DD you supply). No signup, no API key. Pure UTC date-only math; no time-of-day/D
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