Date.prototype.setMilliseconds()

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

The setMilliseconds() method of Date instances changes the milliseconds for this date according to local time.

Try it

const event = new Date("August 19, 1975 23:15:30");

console.log(event.getMilliseconds());
// Expected output: 0

event.setMilliseconds(456);

console.log(event.getMilliseconds());
// Expected output: 456

Syntax

js
setMilliseconds(millisecondsValue)

Parameters

millisecondsValue

An integer between 0 and 999 representing the milliseconds.

Return value

Changes the Date object in place, and returns its new timestamp. If millisecondsValue is NaN (or other values that get coerced to NaN, such as undefined), the date is set to Invalid Date and NaN is returned.

Description

If you specify a number outside the expected range, the date information in the Date object is updated accordingly. For example, if you specify 1005, the number of seconds is incremented by 1, and 5 is used for the milliseconds.

Examples

Using setMilliseconds()

js
const theBigDay = new Date();
theBigDay.setMilliseconds(100);

Specifications

Specification
ECMAScript® 2025 Language Specification
# sec-date.prototype.setmilliseconds

Browser compatibility

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See also