how to get all hour value in javascript code example

Example 1: javascript make new date from hour

// Like Fri, 26 Sep 2014 18:30:00 GMT
var today = new Date();

var myToday = new Date(today.getFullYear(), today.getMonth(), today.getDate(), 0, 0, 0);

Example 2: js date get hours

const birthday = new Date('March 13, 08 04:20');

console.log(birthday.getHours());
// expected output: 4