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Showing content from https://webplatform.github.io/docs/javascript/Date/setUTCHours below:

setUTCHours · WebPlatform Docs

setUTCHours Summary

Sets the hours value in the Date object using Universal Coordinated Time (UTC).

Syntax

dateObj.setUTCHours( numHours [ , numMin [ , numSec [ , numMilli ]]] )

dateObj: Required. Any Date object.
numHours: Required. A numeric value equal to the hours value.
numMin: Optional. A numeric value equal to the minutes value. Must be supplied if either numSec or numMilli are used.
numSec: Optional. A numeric value equal to the seconds value. Must be supplied if numMilli argument is used.
numMilli: Optional. A numeric value equal to the milliseconds value.

Examples

The following example illustrates the use of the setUTCHours method.

function SetUTCHoursDemo(nhr, nmin, nsec){
    var d, s;                        
    d = new Date();                  
    object.d.setUTCHours( nhr , nmin , nsec ) ;  
    s = "Current setting is " + d.toUTCString()
    return(s);                       
 }

Remarks

All set methods taking optional arguments use the value returned from corresponding get methods, if you do not specify an optional argument. For example, if the numMin argument is not specified, JavaScript uses the value returned from the getUTCMinutes method.

To set the hours value using local time, use the setHours method.

If the value of an argument is greater than its range, or is a negative number, other stored values are modified accordingly. For example, if the stored date is "Jan 5, 1996 00:00:00.00", and setUTCHours(30) is called, the date is changed to “Jan 6, 1996 06:00:00.00.”