Скачать или смотреть Solving the Object Returning Wrong Date Format in JavaScript

Learn how to correctly retrieve hours from a JavaScript Date object and avoid common pitfalls with date formats.
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This video is based on the question https://stackoverflow.com/q/65225694/ asked by the user 'Bruno Pigatto' ( https://stackoverflow.com/u/7853368/ ) and on the answer https://stackoverflow.com/a/65225720/ provided by the user 'clod9353' ( https://stackoverflow.com/u/14780760/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Solving the Object Returning Wrong Date Format in JavaScript

When working with dates in JavaScript, it's common to encounter situations that can lead to confusion, especially when trying to extract specific pieces of information like hours. A frequently asked question is: Why am I getting an undefined value when accessing hours from a Date object? Let’s delve into this issue and understand how to fix it.

The Problem: Confusion with Date Methods

Imagine you have a date string stored in a variable, something like this:

[[See Video to Reveal this Text or Code Snippet]]

You create a new Date object with this string:

[[See Video to Reveal this Text or Code Snippet]]

Everything seems to be in order so far. However, when you try to access the hour like this:

[[See Video to Reveal this Text or Code Snippet]]

You scratch your head and wonder, Is the property returning an invalid date format? Let’s clarify what’s going wrong here and how you can get the hour value you need.

Understanding the Date Object in JavaScript

JavaScript provides a built-in Date object that allows you to work with dates and times. It's important to know that while accessing parts of a date, there are specific methods you need to use.

Key Date Methods

getDate() - Returns the day of the month (1-31).

getMonth() - Returns the month (0-11).

getFullYear() - Returns the year (4 digits).

getHours() - Returns the hour (0-23).

What Went Wrong?

In your case, when you try to access date.hour, you receive undefined because there is no hour property directly accessible on the Date object. Instead, you should use the getHours() method to retrieve the hour value.

The Solution: Using the Correct Method

To correctly obtain the hour from your Date object, simply change your code from:

[[See Video to Reveal this Text or Code Snippet]]

to:

[[See Video to Reveal this Text or Code Snippet]]

Example Implementation

Here’s how your code would look in full:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

In summary, it's easy to stumble when working with Date objects in JavaScript due to the various methods available to retrieve different parts of the date. Always remember to use getHours() to access hours instead of trying to access properties like hour. By following the correct methods, you can avoid errors and confidently manipulate date and time in your JavaScript projects.

If you have any further questions about working with dates in JavaScript or you're facing a related issue, feel free to ask!