Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The millisecond accessor property of Temporal.ZonedDateTime instances returns a integer from 0 to 999 representing the millisecond (10-3 second) component of this time.
The set accessor of millisecond is undefined. You cannot change this property directly. Use the with() method to create a new Temporal.ZonedDateTime object with the desired new value.
For general information and more examples, see Temporal.PlainTime.prototype.millisecond.