JavaScript PlainDate compare()
Example
const date1 = Temporal.PlainDate.from("2026-05-17");
const date2 = Temporal.PlainDate.from("2026-05-17");
let result = Temporal.PlainDate.compare(date1, date2);
Try it Yourself »
Description
The Temporal.PlainDate.compare() method returns -1, 0, or 1 indicating if the first date
is before, equal to, or later than the second.
Syntax
Temporal.PlainDate.compare(date1, date2)
Parameters
| Parameter | Description |
| date1 | The first date to compare. |
| date2 | The second date to compare. |
Return Value
| Type | Description |
| Number | -1 if date1 is before date2. 0 if they are equal. 1 if date1 is after than date2. |
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 before the summer of 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
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, you can use the official polyfill.
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>
