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https://issues.apache.org/jira/browse/LOG4J2-1246?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16710334#comment-16710334
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Ralph Goers commented on LOG4J2-1246:
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Yeah - they are using OFFSET to mean that it will display the timezone offset
from UTC.
For 3.0 I'd prefer that we keep the existing names for compatibility but also
provide definitions for all the constants in DateTimeFormatter. So we might
have the same pattern with 2 names.
> 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
> Fix For: 2.11.2
>
>
> 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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