ppkarwasz commented on code in PR #3789:
URL: https://github.com/apache/logging-log4j2/pull/3789#discussion_r2196942219
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log4j-core/src/main/java/org/apache/logging/log4j/core/pattern/DatePatternConverter.java:
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@@ -109,40 +109,19 @@ private static String readPattern(@Nullable final
String[] options) {
* @since 2.25.0
*/
static String decodeNamedPattern(final String pattern) {
- // If legacy formatters are enabled, we need to produce output aimed
for `FixedDateFormat` and `FastDateFormat`.
Review Comment:
I've moved the original comment to `NamedInstantPattern#getLegacyPattern()`
and reformatted it as Javadoc in
https://github.com/apache/logging-log4j2/pull/3789/commits/e3c6f6d1907b4717dfdfdebeffec2f408315a614.
I also adjusted the tone slightly. In my view, the use of the `n` pattern
letter in legacy formats isn't a violation of the `SimpleDateFormat` contract,
but rather a Log4j-specific extension—similar to how `FastDateFormat` extends
support for `Z`. While I agree that `DateTimeFormatter` was already available
when microsecond and nanosecond support was added in Log4j 2.11.0, and that
choosing `n` may not have been ideal in hindsight, it was a deliberate design
decision.
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