Time convert

Convert between epoch (s or ms), ISO 8601, and any IANA timezone. Send POST /api/time-convert with the required field value and pay $0.001 per call over x402 or MPP, or call it free by solving a proof-of-work challenge. It returns a JSON object with utc, epochSeconds, epochMillis, timezone, local and 2 more.

Give a value (epoch seconds or milliseconds, an ISO string, or 'now'), get every representation back: utc, epochSeconds, epochMillis and, with tz, timezone, localIso (ISO 8601 with the zone's offset, e.g. 2026-06-11T19:00:00+09:00), utcOffset and local (a display string). A bare number under 1e12 is read as seconds, otherwise as milliseconds.

Category: Time & scheduling · Tags: time epoch timezone convert iso8601

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Parameters

Example request

curl -i -X POST https://agent402.tools/api/time-convert \
  -H "Content-Type: application/json" \
  -d '{"value":1781172000,"tz":"Asia/Tokyo"}'

Without payment this returns HTTP 402 Payment Required with the exact price for time-convert; any x402 v2 or MPP client pays it and retries.

Example response

{
  "utc": "2026-06-11T10:00:00.000Z",
  "epochSeconds": 1781172000,
  "epochMillis": 1781172000000,
  "timezone": "Asia/Tokyo",
  "local": "2026-06-11, 19:00:00 GMT+9",
  "localIso": "2026-06-11T19:00:00+09:00",
  "utcOffset": "+09:00"
}

From an MCP client

catalog.call {
  "slug": "time-convert",
  "params": {
    "value": 1781172000,
    "tz": "Asia/Tokyo"
  }
}

On the hosted connector at https://agent402.tools/mcp, catalog.call runs time-convert free (rate-limited, no wallet). Local install: npx -y agent402-mcp.

Errors and behavior

• value is required. An input the tool rejects returns an HTTP 4xx whose body carries error, tool, expected, required and example, so the caller can correct it.
• A paid call that ends in any status of 400 or above is not charged over x402, MPP or a prepaid credits key: settlement is cancelled when the tool fails. The exception is a Tempo push credential, a transfer the buyer sent before the call: it settles before the tool runs, so if the tool then fails the payment is recorded as a refund owed to the paying wallet.
• Free tier: no outbound network call leaves the server for this tool, so proof-of-work (16 leading zero bits of sha256) pays for it.
• A GET or HEAD to /api/time-convert returns the same 402 quote, so the price can be read without a body.
• An Idempotency-Key header makes a retried paid call replay the first 200 instead of charging again (an answer larger than 1 MB is not replayed).

Paid call (JavaScript agent)

import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client();
client.setSpendControls?.(false); // keep your own spending ceiling in code
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/api/time-convert", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "value": 1781172000,
    "tz": "Asia/Tokyo"
  }),
});

No wallet? Pay with compute

Fetch a challenge, solve the sha256 puzzle (16 leading zero bits, a fraction of a second of CPU), and resend with the X-Pow-Solution header:

import { createHash } from "node:crypto";
const lz = (b) => { let t = 0; for (const x of b) { if (!x) { t += 8; continue; } t += Math.clz32(x) - 24; break; } return t; };
const c = await (await fetch("https://agent402.tools/api/pow/challenge?slug=time-convert")).json();
let n = 0;
while (lz(createHash("sha256").update(c.challenge + ":" + n).digest()) < c.difficulty) n++;
await fetch("https://agent402.tools/api/time-convert", { method: "POST", headers: { "X-Pow-Solution": c.token + ":" + n, "Content-Type": "application/json" }, body: JSON.stringify({"value":1781172000,"tz":"Asia/Tokyo"}) });

Part of these workflows

Time convert is one step in these 3 skill packs, each sold as a single call:

• Multi-stop trip planner - Plan a multi-stop journey deterministically: geocode each stop, sum the pairwise haversine distances, estimate arrival times by adding driving hours per leg, count business days from today to each arrival, and pull the weather forecast at every US stop. Six tools - three pure-CPU (math + time), three egress (geocoding + weather) - covering the deterministic skeleton of every road-trip / sales-tour / delivery-route planning problem.
• Timezone planner - Time zone conversion, business day calculation, and cron schedule preview - scheduling in one pass.
• Webhook secure intake - The production ingest path for every incoming webhook: verify the provider signature (GitHub / Stripe / Shopify / Slack, constant-time, replay-window enforced), schema-validate the now-trusted body against the provider envelope, fingerprint the raw bytes for redelivery dedup, normalize the event timestamp to UTC + epoch, and redact PII before anything hits a log. Five pure-CPU tools - the accept-or-reject gate, run on every event.

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