Timezone Truth MCP MCP server

Timezone Truth provides an MCP server that exposes the same engine behind its web page, allowing agents to convert times between IANA zones and detect skipped or ambiguous DST local times. It serves as a thin wrapper over a pure function, ensuring consistency across its markdown, JSON API, and MCP server surfaces. The service is free with rate limits and is part of the Project Gumball portfolio.

Endpoint and access

No sign-in: your client connects and lists tools immediately, with no account or key.

No sign-inEndpoint checked 2026-10-05Operated by Gumball Tools

MCP endpoint (Streamable HTTP)

https://timezone-truth.gumballtools.com/api/mcp

Vendor documentation

What you can do with it

Convert times between IANA time zones
Detect skipped or ambiguous DST local times
Access timezone data via JSON API
Use timezone tools in Claude Code or Cursor

Tools advertised by the last live check:

convert_time

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

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Claude Code

Run this once in a terminal. It registers a Streamable HTTP server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

claude mcp add --transport http timezone-truth-mcp https://timezone-truth.gumballtools.com/api/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).

Codex configuration

codex mcp add timezone-truth-mcp --url https://timezone-truth.gumballtools.com/api/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable timezone-truth-mcp in your MCP settings.

Cursor configuration

{
  "mcpServers": {
    "timezone-truth-mcp": {
      "url": "https://timezone-truth.gumballtools.com/api/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure). The type must be streamableHttp for a remote HTTP server.

Cline configuration

{
  "mcpServers": {
    "timezone-truth-mcp": {
      "type": "streamableHttp",
      "url": "https://timezone-truth.gumballtools.com/api/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start timezone-truth-mcp and inspect its tools.

VS Code configuration

{
  "servers": {
    "timezone-truth-mcp": {
      "type": "http",
      "url": "https://timezone-truth.gumballtools.com/api/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.

Gemini CLI configuration

gemini mcp add --transport http timezone-truth-mcp https://timezone-truth.gumballtools.com/api/mcp

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.

Claude Desktop configuration

{
  "mcpServers": {
    "timezone-truth-mcp": {
      "url": "https://timezone-truth.gumballtools.com/api/mcp"
    }
  }
}

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.

Windsurf configuration

{
  "mcpServers": {
    "timezone-truth-mcp": {
      "serverUrl": "https://timezone-truth.gumballtools.com/api/mcp"
    }
  }
}

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