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meridian-mcp

by marcusicaro
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meridian-mcp

An MCP server that helps LLMs reason about time across distributed teams: convert between timezones, look up current times around the world, and find overlapping working-hour slots for meetings.

Built in TypeScript on the official MCP SDK. Works with Claude Desktop, Claude Code, and any other MCP-compatible client.

Tools

Tool

What it does

convert_time

Convert a time (HH:mm or full ISO) from one IANA timezone to another. Reports the day delta.

current_time

Returns the current local time for each IANA timezone in a list.

find_meeting_slot

Given participants in different timezones (with optional working hours) and a target date, returns the overlapping working window and a suggested slot in everyone's local time.

Related MCP server: MCP Node Time

Install

git clone https://github.com/marcusicaro/meridian-mcp.git
cd meridian-mcp
npm install
npm run build

Use with Claude Desktop

Add the server to claude_desktop_config.json:

{
  "mcpServers": {
    "meridian": {
      "command": "node",
      "args": ["/absolute/path/to/meridian-mcp/dist/index.js"]
    }
  }
}

Restart Claude Desktop. The three tools become available to the model.

Use with Claude Code

claude mcp add meridian -- node /absolute/path/to/meridian-mcp/dist/index.js

Example prompts

"What time is it now in São Paulo, Auckland, and London?"

"If our standup is at 09:30 in America/Sao_Paulo on 2026-05-20, what time is that in Pacific/Auckland?"

"Find a 45-minute meeting slot on 2026-05-22 that works for Marcus in São Paulo (09:00–18:00) and Lin in Auckland (09:00–17:00)."

Development

npm run dev     # tsc --watch
npm start       # run the built server on stdio

The server speaks MCP over stdio. To inspect it manually, use the MCP Inspector:

npx @modelcontextprotocol/inspector node dist/index.js

License

MIT — see LICENSE.

This server cannot be installed

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Maintenance

ActivityInactive
ResponsivenessNo issues

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