The error: “DeprecationWarning: Pattern %d{DATE} is deprecated due to the confusion it causes when used. Please use %d{DATETIME} instead” is a common error that can show up in many ways. In this blog, we will go through some of the ways you can fix this issue. Read on.

The reason of  “DeprecationWarning: Pattern %d{DATE} is deprecated due to the confusion it causes when used. Please use %d{DATETIME} instead” error

You might get the following deprecation message.

(node:14940) [log4js-node-DEP0004] DeprecationWarning: Pattern %d{DATE} is deprecated due to the confusion it causes when used. Please use %d{DATETIME} instead.

The reason you got this error is due to karma, you are receiving a deprecation warning with it. To get the best efficiency, Karma has to be informed about your project in order to test it properly and this is done through a configuration file. The karma init command is the simplest way to create an initial configuration file. Remember that the majority of framework adapters, reporters, preprocessors, and launchers require plugin loading. JavaScript or CoffeeScript can be used to create the Karma configuration file, which is loaded like any other Node.js module. In the file of configuration, the configuration code is associated with each other by building module.exports to point to a function that receives an argument: the object of configuration.

How to solve “DeprecationWarning: Pattern %d{DATE} is deprecated due to the confusion it causes when used. Please use %d{DATETIME} instead” error

Approach: Upgrade karma

To fix the “DeprecationWarning: Pattern %d{DATE} is deprecated due to the confusion it causes when used. Please use %d{DATETIME} instead” error, you must upgrade your karma. So simply update karma to ^6.3.12 and your problem should be resolved.

Conclusion

We hope you enjoyed our article about the error. With this knowledge, we know that you can fix your error: “DeprecationWarning: Pattern %d{DATE} is deprecated due to the confusion it causes when used. Please use %d{DATETIME} instead” quickly by following these steps! If you still have any other questions about fixing this syntax error, please leave a comment below. Thank you for reading!

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