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javascript instance accessor property

Temporal.Duration.prototype.milliseconds

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The milliseconds accessor property of Duration instances returns an integer representing the number of milliseconds in the duration.

Unless the duration is balanced, you cannot assume the range of this value, but you can know its sign by checking the duration’s sign property. If it is balanced to a unit above milliseconds, the milliseconds absolute value will be between 0 and 999, inclusive.

The set accessor of milliseconds is undefined. You cannot change this property directly. Use the with() method to create a new Temporal.Duration object with the desired new value.

Examples

Using milliseconds

const d1 = Temporal.Duration.from({ seconds: 1, milliseconds: 500 });
const d2 = Temporal.Duration.from({ seconds: -1, milliseconds: -500 });
const d3 = Temporal.Duration.from({ seconds: 1 });
const d4 = Temporal.Duration.from({ milliseconds: 1000 });

console.log(d1.milliseconds); // 500
console.log(d2.milliseconds); // -500
console.log(d3.milliseconds); // 0
console.log(d4.milliseconds); // 1000

// Balance d4
const d4Balanced = d4.round({ largestUnit: "seconds" });
console.log(d4Balanced.milliseconds); // 0
console.log(d4Balanced.seconds); // 1

Specifications

SpecificationsStandards references are available on the canonical MDN page.

Browser compatibility

Browser compatibilityCompatibility data is available on the canonical MDN page.

See also