date.setHours

The setHours() method sets the hours for a specified date according to local time, and returns the number of milliseconds since 1 January 1970 00:00:00 UTC until the time represented by the updated Date instance.

Syntax

dateObj.setHours(hoursValue[, minutesValue[, secondsValue[, msValue]]])

Versions prior to JavaScript 1.3

dateObj.setHours(hoursValue)

Parameters

hoursValue

An integer between 0 and 23, representing the hour.

minutesValue

Optional. An integer between 0 and 59, representing the minutes.

secondsValue

Optional. An integer between 0 and 59, representing the seconds. If you specify the secondsValue parameter, you must also specify the minutesValue.

msValue

Optional. A number between 0 and 999, representing the milliseconds. If you specify the msValue parameter, you must also specify the minutesValue and secondsValue.

Return value

The number of milliseconds between 1 January 1970 00:00:00 UTC and the updated date.

Description

If you do not specify the minutesValue, secondsValue, and msValue parameters, the values returned from the getMinutes(), getSeconds(), and getMilliseconds() methods are used.

If a parameter you specify is outside of the expected range, setHours() attempts to update the date information in the Date object accordingly. For example, if you use 100 for secondsValue, the minutes will be incremented by 1 (minutesValue + 1), and 40 will be used for seconds.

Examples

Using setHours()

var theBigDay = new Date();
theBigDay.setHours(7);

Specifications

Specification	Status	Comment
ECMAScript 1st Edition (ECMA-262)	Standard	Initial definition. Implemented in JavaScript 1.0.
ECMAScript 5.1 (ECMA-262) The definition of 'Date.prototype.setHours' in that specification.	Standard
ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'Date.prototype.setHours' in that specification.	Standard
ECMAScript 2017 Draft (ECMA-262) The definition of 'Date.prototype.setHours' in that specification.	Draft

Browser compatibility

See also

• Date.prototype.getHours()
• Date.prototype.setUTCHours()