meridian-mcp
A timezone-aware MCP server that converts times, looks up current local times, and finds overlapping working-hour slots for distributed teams.
README
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. |
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.
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