MCP server

Timezone Truth

com.gumballtools/timezone-truth

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

Convert times between IANA zones and detect skipped or ambiguous DST local times.

Working at last checkVerified publisher: gumballtools.comAbout 743 tokens per request once connected1 toolsDescription tries to instruct AI agents

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

At a glance

Type: MCP server
Publisher: gumballtools.com (verified by the MCP Registry)
Status: Working at last check
Tools: 1
Token cost: About 743 tokens per request
Sets up in: Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok
Last checked: 26 Oct 2026, 08:29 UTC

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

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

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.timezone-truth]
url = "https://timezone-truth.gumballtools.com/api/mcp"

Gemini CLI

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

Cursor

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

VS Code

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

Antigravity

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

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"timezone-truth","server_url":"https://timezone-truth.gumballtools.com/api/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"timezone-truth","server_url":"https://timezone-truth.gumballtools.com/api/mcp"}

convert_time ~743 tokens
Convert a wall-clock time between two IANA timezones, and report the ways the conversion can be wrong. ALWAYS use this instead of doing the arithmetic. Timezone conversion looks like addition and is not: the mapping from a local time to an instant is not a function. - On the spring-forward date, a

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