ChronoGate

ChronoGate

Timezone and business-day truth for scheduling agents. LLMs guess at "now", DST and holidays; ChronoGate answers authoritatively: current time in any IANA zone, DST-safe conversion, relative expressions ("next Tuesday 3pm", "in 3 business days"), and public-holiday-aware business days for 100+ countries (via Nager.Date).

• Remote MCP: https://chronogate-self.vercel.app/mcp (Streamable HTTP, JSON-RPC, protocol 2025-06-18, stateless)
• Docs for agents: https://chronogate-self.vercel.app/llms.txt
• Free tier: 200 calls/day per IP, no API key. Over the limit returns HTTP 402 (with buy link); resets 00:00 UTC. Paid tier coming.

MCP tools

Tool	What it does
now	Current instant + wall-clock time, offset and DST flag in an IANA zone
convert	Convert an ISO timestamp between zones, DST-safe
resolve_expression	Resolve "tomorrow 9am", "next Tuesday 3pm", "in N business days" to an exact instant
is_business_day	Weekend + public-holiday check for a date and country
add_business_days	Add N business days to a date, skipping weekends and holidays

Client config

{
  "mcpServers": {
    "chronogate": {
      "type": "http",
      "url": "https://chronogate-self.vercel.app/mcp"
    }
  }
}

REST

curl "https://chronogate-self.vercel.app/v1/now?tz=America/Chicago"
curl "https://chronogate-self.vercel.app/v1/convert?iso=2026-03-08T08:00:00Z&to=America/Chicago"
curl "https://chronogate-self.vercel.app/v1/resolve?expr=next%20Tuesday%203pm&tz=America/Chicago"
curl "https://chronogate-self.vercel.app/v1/business-day?date=2026-07-03&country=US"
curl "https://chronogate-self.vercel.app/v1/business-days/add?start=2026-07-02&days=3&country=US"

# MCP over plain HTTP
curl -X POST https://chronogate-self.vercel.app/mcp -H 'content-type: application/json' \
  -H 'accept: application/json, text/event-stream' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'

Run locally

npm install && npm run dev   # local server
npm test                     # smoke tests

Deploys as Vercel serverless functions (see vercel.json).

Notes

• Holidays come from the public Nager.Date API; if it's unavailable, weekend logic still works (holiday_source: "unavailable").
• Terms
• ChronoGate is not affiliated with chronogate.io.

MIT licensed.

Paid credits

• $5 = 20,000 calls (one-time pack, no subscription). Buy: https://buy.stripe.com/3cIeVec3Hagz6ZBc4VgMw00
• After paying you land on /success, which shows your cg_ API key once (kept 7 days).
• REST: Authorization: Bearer cg_.... MCP: same header on https://chronogate-self.vercel.app/mcp
• 1 credit per call. Unknown key → 401. Empty key or free tier used up → 402 with a buy link.

Docker (stdio MCP)

docker build -t chronogate .
docker run -i --rm chronogate        # MCP over stdio; wrap with mcp-proxy for HTTP
npm run healthcheck                  # initialize + tools/list handshake (also the Docker HEALTHCHECK)