GitHub user ppkarwasz added a comment to the discussion: Getting current
date-time format (or default format)
You might consider a different approach to keep the date format consistent
between your application output and Log4j logs.
Here’s a flexible strategy:
1. **Define a shared default format**, such as the one Log4j uses by default:
`yyyy-MM-dd HH:mm:ss,SSS`.
2. **Document a system property**, for example `myapp.date.format`, to allow
users to override the default format if needed.
3. **Use this property in your application code**:
```java
String pattern = System.getProperty("myapp.date.format", "yyyy-MM-dd
HH:mm:ss,SSS");
```
4. **Add the same default value to your Log4j configuration** to ensure both
log and app output are in sync:
```xml
<Properties>
<Property name="myapp.date.format" value="yyyy-MM-dd HH:mm:ss,SSS"/>
</Properties>
```
5. **Reference the system property in your `PatternLayout`**:
```xml
<PatternLayout pattern="%d{${sys:myapp.date.format}} [%t] %-5level %logger -
%msg%n"/>
```
The `${sys:myapp.date.format}` expression will try to find the
`myapp.date.format` system property and fallback to `${myapp.date.format}`.
This approach gives you consistent date formatting across your application and
logs, while also allowing users to customize the format through configuration
rather than modifying code.
GitHub link:
https://github.com/apache/logging-log4j2/discussions/3788#discussioncomment-13601663
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