Скачать или смотреть How to Parse a yyyy-MM-dd HH:mm:ss to Date in Java

Learn how to effectively parse a date string formatted as `yyyy-MM-dd HH:mm:ss` in Java, using modern date-time APIs for accurate results.
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This video is based on the question https://stackoverflow.com/q/73541808/ asked by the user 'Victor' ( https://stackoverflow.com/u/16862042/ ) and on the answer https://stackoverflow.com/a/73542251/ provided by the user 'Calabacin' ( https://stackoverflow.com/u/1866010/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding Date Parsing in Java

Parsing date strings is a common task in Java applications, but it can sometimes be confusing, especially when the format does not match the expected patterns. This guide addresses the issue of how to parse a date string formatted as yyyy-MM-dd HH:mm:ss into a Java Date object.

The Problem

You may encounter situations where you attempt to parse a date string, such as "2020-04-14 16:34:40.0117372", into a Date object but receive a ParseException. This error indicates that the format you used to parse the date does not match the format of the input string.

Example of Incorrect Code

Here's an example of code that leads to a ParseException:

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

In this case, the format string "dd/MM/yyyy HH:mm:ss" is incorrectly structured for the date string you're trying to parse.

The Solution

To resolve the parsing issue, you need to ensure that the date format you are using aligns with the structure of the date string. In this case, you should be using the format yyyy-MM-dd HH:mm:ss.SSSSSSS.

Updated Parsing Code

You can fix the code by adopting the newer java.time package, which offers a more robust and flexible way to handle date-time formatting. Here’s how you can do it:

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

Key Changes Made:

Correct Format: Change dd/MM/yyyy to yyyy-MM-dd to match the input date string.

Using LocalDateTime: Instead of the older Date class, LocalDateTime is utilized for better handling of date-time representations.

Milliseconds and Nanoseconds: When formatting, the millisecond section contains 7 digits which include both milliseconds and nanoseconds. You typically want 3 digits for milliseconds, but Java can handle the full precision you have.

Conclusion

Parsing date strings is essential, especially when dealing with data input in various formats. By ensuring your formats match and utilizing Java's updated time APIs, you can avoid common pitfalls, such as ParseException. Using the java.time package not only simplifies the parsing process but also makes your code cleaner and easier to maintain.

Now, you should be equipped with the knowledge to parse dates effectively in Java. Happy coding!