Temporal Migrate
Migrate one boundary at a time. An existing Date timestamp can become a Temporal Instant without pretending it was a date-only value.
Where to run this
This example uses the JavaScript console playground. Select Run to execute it; the example does not run on this lesson page.
A practical example
if (typeof Temporal === "undefined") {
console.log("Temporal is not available in this runtime. Use a supporting browser or a reviewed local polyfill.");
} else {
const oldValue = new Date("2026-11-07T10:00:00Z");
const instant = Temporal.Instant.fromEpochMilliseconds(oldValue.getTime());
console.log(instant.toString());
}
What happens
The exact instant is preserved.