JavaScript PlainDate toPlainDateTime()
Example
const date = Temporal.PlainDate.from("2026-05-17")
const dateTime = date.toPlainDateTime("14:30:00");
Try it Yourself »
Description
The toPlainDateTime() method returns a new Temporal.PlainDateTime
object representing this date and this time in this calendar system.
The toPlainDateTime() method does not change the original plain date.
Syntax
plaindate.toPlainDateTime(plaintime)
Parameters
| Parameter | Description |
| plaintime | A string or an object representing a plain time. |
Return Value
| Type | Description |
| Object | A Temporal.PlainDateTime object representing this date and time. |
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>
