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https://issues.apache.org/jira/browse/LOG4J2-1246?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16696473#comment-16696473
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Ralph Goers commented on LOG4J2-1246:
-------------------------------------
Gary, the easy fix for this is to create an enum in DatePatternConverter that
is similar to FixedFormat containing the patterns you want to support. Then in
DatePatternConverter.createNonFixedFormatter see if the passed pattern matches
one of then enum patterns and if so pass the pattern associated with the enum
to FastDateFormat.getInstance().
> PatternLayout %date conversion pattern should render time zone designator for
> ISO-ISO8601
> -----------------------------------------------------------------------------------------
>
> Key: LOG4J2-1246
> URL: https://issues.apache.org/jira/browse/LOG4J2-1246
> Project: Log4j 2
> Issue Type: Bug
> Components: Pattern Converters
> Affects Versions: 2.4.1, 2.5
> Reporter: Daniel Marcotte
> Priority: Major
>
> Hi there!
> There might be a small issue with the Pattern Converters regarding Timezone
> management:
> http://logging.apache.org/log4j/2.x/manual/layouts.html#PatternLayout
> Right now, these patterns:
> * {{"%d\{ISO8601_BASIC\}}}
> * {{%d\{ISO8601_BASIC\}\{UTC\}}}
> Give the same results:
> * {{20160104T204256,048}}
> * {{20160104T204256,048}}
> However, with a deeper look at the ISO-8601 standards, the second one with
> {{"\{UTC\}"}} should properly add the Timezone at the end of the timestamp.
> Reference: https://en.wikipedia.org/wiki/ISO_8601#Times
> {quote}
> *UTC*
> If the time is in UTC, add a Z directly after the time without a space. Z is
> the zone designator for the zero UTC offset. "09:30 UTC" is therefore
> represented as "09:30Z" or "0930Z". "14:45:15 UTC" would be "14:45:15Z" or
> "144515Z".
> UTC time is also known as 'Zulu' time, since 'Zulu' is the NATO phonetic
> alphabet word for 'Z'.
> *Examples*
> <time>Z
> <time>±hh:mm
> <time>±hhmm
> <time>±hh
> {quote}
> As of ISO-8601, the results should be one of the following (configurable?):
> * {{20160104T204256,048Z}}
> * {{20160104T204256,048+00:00}}
> * {{20160104T204256,048+0000}}
> * {{20160104T204256,048+00}}
> Another reference:
> http://stackoverflow.com/questions/833102/wheres-the-datetime-z-format-specifier
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