JavaScript Instant toZonedDateTimeISO()
Example
const instant = Temporal.Instant.from("2026-05-17T14:30:00Z")
const zoned = instant.toZonedDateTimeISO("America/New_York");
Try it Yourself »
Description
The toZonedDateTimeISO() method returns a new ZonedDateTime
object representing this instant in the specified time zone in the ISO 8601 calendar system.
The toZonedDateTimeISO() method does not change the original instant.
Syntax
instant.toZonedDateTimeISO(zone)
Parameters
| Parameter | Description |
| zone | A string representing the time zone to use. |
Return Value
| Type | Description |
| Object | A ZonedDateTime object representing this instant in the specified time zone. |
Browser Support
Temporal is a major update to the JavaScript standard (TC39).
It is currently supported in Chrome, Edge, Firefox, and Opera Safari has not shipped it yet.
| Chrome 144 |
Edge 144 |
Firefox 139 |
Safari |
Opera 128 |
| Jan 2026 | Jan 2026 | May 2025 | 🚫 | Feb 2026 |
The Safari implementation can be tested in Safari Technology Preview by enabling the --use-temporal runtime flag.
Polyfill
Until Safari supports Temporal natively, you can use the official polyfill:
<script
src="https://cdn.jsdelivr.net/npm/@js-temporal/polyfill@0.5.1/dist/index.umd.js">
</script>