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Learn how to convert various date formats into `YYYY-MM-DD HH:MM:SS` in Java using `DateTimeFormatter`. Follow our detailed guide and troubleshoot common issues.
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How to Convert Date to YYYY-MM-DD HH:MM:SS Format in Java

Dealing with dates can often be a tricky task in programming, especially when it comes to formatting them in a way that suits your application's needs. If you’re working with dates in Java and need to convert various input formats into the standard YYYY-MM-DD HH:MM:SS, you might run into some issues. In this guide, we will walk through how to correctly perform this conversion using the DateTimeFormatter class while resolving common errors you might encounter along the way.

The Challenge

You may face a common scenario where you receive date inputs in different formats but want to standardize them into the YYYY-MM-DD HH:MM:SS format. For example, if your input date is “26-08-1990 10:12:11”, your goal is to transform it into “1990-08-26 10:12:11”.

However, you might encounter errors like:

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

This can occur due to mismatched input formats. Let’s explore how to set up your Java code to address these challenges.

The Solution

To convert dates into the desired format, we’ll utilize the DateTimeFormatter class combined with LocalDateTime. Below is a step-by-step breakdown of the solution.

Step 1: Define Input Formats

First, you will need to define the various input formats that your application will accept. The DateTimeFormatter allows you to create a custom pattern for parsing different date formats. Here’s how to do it:

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

In this pattern, you specify several potential formats that the input can match, making it flexible for different date formats.

Step 2: Parse the Input Date

Once you define your input formats, you can then parse the date string using LocalDateTime.parse(). Here’s a snippet that demonstrates this:

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

Step 3: Format the Output Date

After successful parsing, you can format the date into YYYY-MM-DD HH:MM:SS using the following code:

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

Complete Example Code

Putting it all together, here's the full code that demonstrates the conversion:

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

Conclusion

By following these steps, you can successfully convert various date formats to YYYY-MM-DD HH:MM:SS in Java. Make sure to handle various input patterns carefully, and always wrap your parsing logic inside a try-catch to gracefully handle any parsing errors.

Happy coding, and may your date conversions always be accurate!