vy commented on code in PR #3789:
URL: https://github.com/apache/logging-log4j2/pull/3789#discussion_r2200140855


##########
log4j-core/src/main/java/org/apache/logging/log4j/core/util/internal/instant/InstantPatternLegacyFormatter.java:
##########
@@ -46,7 +46,10 @@ final class InstantPatternLegacyFormatter implements 
InstantPatternFormatter {
     private final BiConsumer<StringBuilder, Instant> formatter;
 
     InstantPatternLegacyFormatter(final String pattern, final Locale locale, 
final TimeZone timeZone) {
-        this.precision = new InstantPatternDynamicFormatter(pattern, locale, 
timeZone).getPrecision();
+        // Replaces 'n' used in legacy patterns with 'S' to obtain the right 
precision.
+        // In legacy patterns, the precision of 'n' depends on the pattern 
length, but
+        // in `DateTimeFormatter`, it is always nanoseconds.
+        this.precision = new 
InstantPatternDynamicFormatter(pattern.replace('n', 'S'), locale, 
timeZone).getPrecision();

Review Comment:
   Got it. Created #3816 to address this. I will revert this change.



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