JavaScript Temporal Instant
Temporal.Instant Object Reference
Revised March 2026
The Temporal.Instant object represents a single point in time.
The Temporal.Instant object has no time zone or calendar.
JavaScript Temporal.Instant Methods
| Method | Description |
|---|---|
| from() | Returns a new Instant object from another object or a string |
| from()fromEpochMilliseconds() | Returns a new Instant object from a number of milliseconds |
| from()fromEpochNanoseconds() | Returns a new Instant object from a number of nanoseconds |
| toZonedDateTimeISO() | Returns a new ZonedDatetime object |
| Arithmetic | |
| add() | Returns a new Instant with a duration added |
| subtract() | Returns a new Instant with a duration subtracted |
| Comparison | |
| compare() | Returns -1, 0, or 1 from comparing two dates |
| equals() | Returns true if two Instant objects are identical |
| since() | Returns the difference since another date |
| until() | Returns the difference until another date |
| Formatting | |
| toString() | Returns an RFC 9557 format string representation |
| toJSON() | Returns an RFC 9557 format string for JSON serialization |
| toLocaleString() | Returns a language-sensitive representation of the date |
| valueOf() | Throws a TypeError (prevents temporals from being converted to primitives) |
Learn More:
Temporal.Instant stores a count of nanoseconds since the Unix epoch: January 1, 1970 00:00:00
Browser Support
Temporal is a major update to the JavaScript standard (TC39).
It is currently fully supported in Chrome, Edge, and Firefox, and is expected to reach full availability across browsers throughout 2026.
| Chrome 144 |
Edge 144 |
Firefox 139 |
Safari |
Opera |
| Jan 2026 | Jan 2026 | May 2025 | 🚫 | 🚫 |
Opera Support
Opera support will probably appear 1-3 browser cycles after Chromium, which often means a few months later.
Safari Support
As of March 2026, Safari has not yet announced a confirmed release date for stable support of the JavaScript Temporal API.
However, the implementation is actively in development and can be tested today in Safari Technology Preview by enabling the --use-temporal runtime flag.
Polyfill
Until Opera and Safari supports Temporal natively, use the official polyfill.
This Polyfill allows Temporal code to run in all browsers today:
Example
<script
src="https://cdn.jsdelivr.net/npm/@js-temporal/polyfill/dist/index.umd.js">
</script>
<script>
// Now you can use Temporal
const today = Temporal.Now.plainDateISO();
</script>
