World Clock Pro: Time & Timezone Converter

Answers "what time is it in..." for AI agents: live time, DST-safe timezone conversion, and clock-change dates for 224,000+ cities via a public remote MCP server, no API key.

GitHub

Documentation

World Clock Pro MCP server

Give your AI agent a real clock. Public, read-only, no API key:

https://worldclock.pro/mcp

Models cannot reliably compute local times, DST transitions, or timezone math on their own. This server gives any MCP-capable assistant live answers from the IANA timezone database and a 224,000+ city registry, with the answer's source page cited in every response.

Live endpoint: https://worldclock.pro/mcp (Streamable HTTP, stateless, JSON-RPC 2.0)
How-to page: worldclock.pro/mcp
Server card: /.well-known/mcp/server-card.json
Registry name: pro.worldclock/time (domain-verified)

Quick connect

Claude Code

claude mcp add --transport http worldclockpro-time https://worldclock.pro/mcp

Claude Desktop — Settings → Connectors → Add custom connector → paste the URL.

Cursor — paste into ~/.cursor/mcp.json (or use the button on worldclock.pro/mcp):

{ "mcpServers": { "worldclockpro-time": { "url": "https://worldclock.pro/mcp" } } }

VS Code

code --add-mcp '{"name":"worldclockpro-time","type":"http","url":"https://worldclock.pro/mcp"}'

ChatGPT — Settings → Apps & Connectors → Advanced settings → enable Developer mode → create a connector with the URL and No authentication. The server is read-only, so it works on plans where custom connectors are limited to read-only tools.

OpenClaw — add to openclaw.json:

{ "mcp": { "servers": { "worldclockpro-time": { "url": "https://worldclock.pro/mcp", "transport": "streamable-http" } } } }

MCP Inspector

npx @modelcontextprotocol/inspector
# Transport: "Streamable HTTP" → URL: https://worldclock.pro/mcp

Tools

Tool	What it does	Try asking
`get_current_time`	Current time in one or many places (up to 50 at once).	"What time is it in Tokyo, Paris, and UTC?"
`convert_time`	Move one moment across time zones, DST-safe.	"If it's 9 AM Monday in New York, what time is it in Sydney?"
`time_by_coordinates`	Time at any point on Earth, by latitude/longitude.	"What's the local time at 48.85, 2.35?"
`get_dst_transitions`	DST observance and exact clock-change dates for any year.	"When do the clocks change in London this year?"
`search_cities`	Multilingual city lookup → canonical slug, IANA zone, coordinates.	"Find cities called 'San Jose'."

Every result includes a source_url linking the matching worldclock.pro page, so answers can cite a live source.

Ways to describe a place

City name or alias — "Tokyo", "new-york", "nyc", "Москва", "São Paulo"
Timezone — IANA id ("America/New_York") or abbreviation ("PST", "ET", "UTC")
Coordinates — latitude + longitude; the answer names the nearest city

Use as a Claude Code plugin

This repo is itself a plugin marketplace:

/plugin marketplace add worldclockpro/worldclock-mcp
/plugin install world-clock@worldclockpro

The plugin wires up the remote MCP server and installs the world-clock skill, which teaches the assistant when to use which tool and the classic timezone traps (EST vs ET, half-hour offsets, date-line weekday changes).

Use as an OpenClaw skill

The same skill follows the Agent Skills format:

npx clawhub@latest install world-clock   # once published on ClawHub
# or copy skills/world-clock/ into your skills directory

Why trust it

Read-only by design. Every tool declares readOnlyHint: true. There are no write operations, no accounts, and nothing to sign in for.
No tracking. Queries are computed in memory and not stored. See the privacy policy.
Live IANA data. DST rules come from the IANA timezone database, updated with the weekly data refresh, never hard-coded.
Run by an established team. The people behind the World Clock Master (Apple Editor's Choice) and World Clock Pro apps.
Domain-verified. The registry listing pro.worldclock/time is published with cryptographic proof of control of worldclock.pro.

Limits and errors

Up to 50 locations per call (search_cities returns up to 25 matches).
Per-IP rate limit: 60 calls per 10 seconds (HTTP 429 with Retry-After beyond that).
Invalid input returns structured errors (LOCATION_NOT_FOUND, INVALID_TIMEZONE, AMBIGUOUS_INSTANT, ...) an agent can read and recover from.

Links

MIT licensed. See SECURITY.md for the security posture.