JavaScript Temporal Instant compare()
Example
const i1 = Temporal.Instant.from("2026-05-17T14:30:00Z");
const i2 = Temporal.Instant.from("2026-05-17T14:30:00Z");
let result = Temporal.Instant.compare(i1, i2);
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Description
The compare() method returns -1, 0, or 1 indicating if the first instant
is shorter, equal to, or longer than the second.
Syntax
Temporal.Instant.compare(instant1, instant2)
Parameters
| Parameter | Description |
| instant1 | The first instant to compare. |
| instant2 | The second instant to compare. |
Return Value
| Type | Description |
| Number | -1 if instant1 is shorter than instant2. 0 if they are equal. 1 if instant1 is longer than instant2. |
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>