tanmaybaid opened a new issue, #3930:
URL: https://github.com/apache/logging-log4j2/issues/3930
## Description
DatePatternConverter incorrectly converting date pattern with comma ","
followed by a whitespace starting Log4J 2.25.0.
For a PatternLayout where date pattern contains comma followed by a
whitespace, the DatePatternConverter is adding a `'` after the `,` in the
converted date string.
For e.g. the pattern layout `%date{EEE, dd MMM yyyy HH:mm:ss zzz}{GMT}`
gives incorrect results.
Actual: `Thu,' 18 Sep 2025 00:42:14 GMT`
Expected: `Thu, 18 Sep 2025 00:42:14 GMT`
Notice the `'` after `,` in the actual response
The issue is related to the "Date & Time Formatting" changes introduced in
Log4J 2.25.0 as described here:
https://logging.apache.org/log4j/2.x/release-notes.html#release-notes-2-25-0-instant-format
This issue is resolved by setting the
[log4j2.instantFormatter](https://logging.apache.org/log4j/2.x/manual/systemproperties.html#log4j2.instantFormatter)
property to legacy
## Configuration
Pattern layout with date pattern that includes `, ` (comma followed by
whitespace), for e.g. `%date{EEE, dd MMM yyyy HH:mm:ss zzz}{GMT}`
**Version:** 2.25.0
**Operating system:** MacOS and Linux
**JDK:** amazon-corretto-21.jdk and amazon-corretto-17.jdk
## Logs
-
```
[Stacktraces, errors, etc. relevant applications logs.]
```
## Reproduction
Publish log using pattern layout `%date{EEE, dd MMM yyyy HH:mm:ss zzz}{GMT}`
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