Hello, I have pushed a branch (#495 <https://github.com/apache/logging-log4j2/pull/495>) incorporating a fix for the formatting of nanoseconds in JsonTemplateLayout. In a nutshell, FixedDateFormat and FastDateFormat support only upto millisecond precision. Hence, I try to employ the following formatters in decreasing efficiency order:
1. Log4j FixedDateFormat 2. Log4j FastDateFormat 3. Java DataTimeFormatter The question you should be asking, how did I make DataTimeFormatter work with Log4j Instants? I have modified MutableInstant to extend from TemporalAccessor and this is the particular part of the review I kindly ask you to check. Kind regards.
