Timezone convert

Convert a datetime from one IANA timezone to another. Accepts ISO 8601, Unix timestamps (seconds or milliseconds), or natural date strings. Returns the converted time in both timezones with UTC offset. ?datetime=2026-06-23T14:00:00&from=America/New_York&to=Asia/Tokyo.

Input

Field	Type	Description
datetime *	string	Datetime to convert (ISO 8601, Unix timestamp, or natural date string)
from *	string	Source IANA timezone (e.g. America/New_York)
to *	string	Target IANA timezone (e.g. Asia/Tokyo)

Example output

{
  "input": "2026-06-23T14:00:00",
  "from": {
    "timezone": "America/New_York",
    "formatted": "06/23/2026, 14:00:00 EDT"
  },
  "to": {
    "timezone": "Asia/Tokyo",
    "formatted": "06/24/2026, 03:00:00 JST"
  },
  "utc": "2026-06-23T18:00:00.000Z"
}

Try it — see the 402 challenge (free)

curl -i "https://agent402.tools/api/timezone-convert?datetime=2026-06-23T14%3A00%3A00&from=America%2FNew_York&to=Asia%2FTokyo"

The response is HTTP 402 Payment Required with exact payment requirements. Any x402 v2 client pays automatically and retries:

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();
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/api/timezone-convert?datetime=2026-06-23T14%3A00%3A00&from=America%2FNew_York&to=Asia%2FTokyo");

No wallet? Pay with compute

This is a pure-CPU tool, so an agent without a wallet can pay with proof-of-work instead of USDC: fetch a challenge, solve the sha256 puzzle (16 leading zero bits — a fraction of a second of CPU, no money, no AI tokens), 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=timezone-convert")).json();
let n = 0;
while (lz(createHash("sha256").update(c.challenge + ":" + n).digest()) < c.difficulty) n++;
await fetch("https://agent402.tools/api/timezone-convert", { method: "GET", headers: { "X-Pow-Solution": c.token + ":" + n } });

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