JavaScript method setHours() to set the hour field of a specified time

Definition and Usage

The setHours() method is used to set the hour field of the specified time.

Syntax

dateObject.setHours(hour,min,sec,millisec)

Parameters	Description
hour	Required. A value representing the hour, between 0 (midnight) ~ 23 (11 p.m.), in local time (the same below)
min	Optional . A value representing minutes, between 0 and 59. Before EMCAScript was standardized, this parameter was not supported.
sec	Optional. A value representing seconds, between 0 and 59. Before EMCAScript was standardized, this parameter was not supported.
millisec	Optional. A value representing milliseconds, between 0 and 999. Before EMCAScript was standardized, this parameter was not supported.

Return value

Adjusted date expressed in milliseconds. Before ECMAScript was standardized, this method returned nothing.

Tips and Notes:

Note: If one of the above parameters is specified with a single digit, JavaScript will add one or two leading 0s to the result.

Note: This method is always used in conjunction with a Date object.

Example

Example 1

In this example, we will set the hour field of the current time to 15 through the setHours() method:

<script type="text/javascript">

var d = new Date()
d.setHours(15)
document.write(d)

</script>

Output:

Tue Nov 07 2017 15:46:45 GMT+0800 (中国标准时间)

Example 2

In this example, we will set the time to 15:35:01 through the setHours() method:

<script type="text/javascript">

var d = new Date()
d.setHours(15,35,1)
document.write(d)

</script>

Output:

Tue Nov 07 2017 15:35:01 GMT+0800 (中国标准时间)

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