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https://issues.apache.org/jira/browse/LOG4J2-1149?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15083256#comment-15083256
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Daniel Marcotte commented on LOG4J2-1149:
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Thanks for the quick answer!
If you look at Wikipedia's explanation of the ISO-8601, section "UTC" :
https://en.wikipedia.org/wiki/ISO_8601#Times
{quote}
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'.
{quote}
That's why I assumed that using something like
{code}"%d{ISO8601_BASIC}{UTC}"{code} would give me something like:
* 20160104T204256,048Z
or something like
* 20160104T204256,048+00
or even
* 20160104T204256,048+00:00
I think it's a bug to leave it blank because it means that the date is "local"
while we manually added the {UTC} timezone flag.
> PatternLayout predefined date pattern with time zone always renders default
> date format
> ---------------------------------------------------------------------------------------
>
> Key: LOG4J2-1149
> URL: https://issues.apache.org/jira/browse/LOG4J2-1149
> Project: Log4j 2
> Issue Type: Bug
> Components: Pattern Converters
> Affects Versions: 2.4
> Reporter: Matt Barron
> Assignee: Remko Popma
> Fix For: 2.4.1
>
>
> The date pattern
> {code}
> "%d{ISO8601}{UTC}"
> {code}
> is rendered as the default date format (yyyy-MM-dd HH:mm:ss,SSS) instead.
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