The toInstant() method of Temporal.ZonedDateTime instances returns a new Temporal.Instant object representing the instant of this date-time.
toInstant()None.
A new Temporal.Instant object representing the instant of this date-time.
const zdt = Temporal.ZonedDateTime.from(
"2021-07-01T12:34:56.987654321-04:00[America/New_York]",
);
const instant = zdt.toInstant();
console.log(instant.toString()); // 2021-07-01T16:34:56.987654321Z