Get Time from Date & Time

Implementation Steps:

Create a WebResource in Dataverse Environment

function getTime(executionContext)
{
var formContext = executionContext.getFormContext();
var Date = formContext.getAttribute("DATETIMEFIELDLOGICALNAME").getValue();
var Hours = Date.getHours();
var Minutes = Date.getMinutes();
alert(Hours + ":" + Minutes);
}

That's it 🙂