The **`getHours`** method in Javascript returns the hour from a specified `Date` object according to the system's local time.

The process is illustrated below:

To use the `getHours` method, you will need to use the following command:

```Javascript
dateObj.getHours()
```

In the code shown above, `dateObj` represents any `Date` object in Javascript.

<h2>Parameters</h2>

The `getHours` method does not take any parameters.

<h2>Return value</h2>

The `getHours` method returns an integer between $0$ and $23$  that represents the hour for a given `Date` object according to the system's local time.

If the `Date` object is invalid, e.g., the number of days in the `Date` object exceeds $31$, then the `getHours` method returns **`NaN`** (Not-A-Number). Similarly, if the `Date` object is empty, then the `getHours` method returns the present hour according to local time.

<h2>Code</h2>

The code below shows how the `getHours` method works in Javascript:

// initializing date objects
var a = new Date("June 29, 2021 10:15:34");
var b = new Date("June 29, 2021 01:50:06");
var c = new Date("June 45, 2021 11:20:35");
var d = new Date();

// extracting hours
console.log("The hour for a is: ", a.getHours());
console.log("The hour for b is: ", b.getHours());
console.log("The hour for c is: ", c.getHours());
console.log("The hour for d is: ", d.getHours());

<h2>Explanation</h2>

First, the code initializes multiple `Date` objects. The `getHours` method proceeds to extract the hour value of each object and outputs the result.

Since objects `a` and `b` are valid `Date` objects, the `getHours` method successfully returns the hour value for each, i.e., $10$ and $1$, respectively.

On the other hand, object `c` has an invalid value for its number of days ($45$). As a result, the `getHours` method returns `NaN` (Not-A-Number). Similarly, object `d` is initialized as an empty `Date` object, so the `getHours` method returns the present hour according to the system's local time.



What is getHours in Javascript?

The getHours method in JavaScript retrieves the hour from a Date object based on local time, returning a value between 0 and 23, or NaN for invalid dates.