Timezone Converter API

Convert a timestamp between any two IANA timezones at the exact UTC offset that applied on that date — daylight saving handled correctly. Clean JSON, no key during beta. A drop-in alternative to paid timezone services (TimeZoneDB, Google Time Zone) — pure code, no upstream cost.

Try it

From zone

To zone

Date & time (in “from” zone)

Get this conversion as JSON (developer API)

curl "https://tz.wrapper-agency.com/api/v1/tz?from=America%2FNew_York&to=Asia%2FTokyo&time=2008-11-04T09%3A00"

Free timezone API — no key during beta. DST-correct, IANA tz database.

Convert a time (live & free during beta)

GET https://tz.wrapper-agency.com/api/v1/tz?from=America/New_York&to=Asia/Tokyo&time=2008-11-04T09:00

{
  "from": "America/New_York",
  "to": "Asia/Tokyo",
  "input": "2008-11-04T09:00",
  "instant": "2008-11-04T14:00:00.000Z",
  "converted": "2008-11-04T23:00:00",
  "fromOffset": "UTC-05:00",
  "toOffset": "UTC+09:00"
}

Convert an epoch timestamp

GET https://tz.wrapper-agency.com/api/v1/tz?from=UTC&to=Europe/London&epoch=1225789200

Also: a machine-readable OpenAPI spec and a paid batch endpoint for agents (POST /api/v1/pro/tz, x402 micropayment).

Why ZoneShift

DST-correct: Uses the actual offset for the date you pass, not a fixed offset — so conversions around clock changes are right.
Pure code, no upstream: Built on the IANA time zone database via the JavaScript Intl API. No third-party API, no surprise rate caps.
Simple & cheap: One call, one JSON answer. Free now; per-call pricing for agents.

New to timezone math in code? Read the developer guide.