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http://jira.qos.ch/browse/LBCORE-137?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12251#action_12251
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Robert Elliot commented on LBCORE-137:
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Just noticed this myself - it does seem a little odd.
> PatternLayout does not really respect ISO8601 for date time
> -----------------------------------------------------------
>
> Key: LBCORE-137
> URL: http://jira.qos.ch/browse/LBCORE-137
> Project: logback-core
> Issue Type: Improvement
> Components: Layout
> Affects Versions: 0.9.19
> Environment: irrelevant here
> Reporter: Brice Dutheil
> Assignee: Logback dev list
>
> Using the default "%d" "%date" or %d{ISO8601} does not output a correct ISO
> 8601 formatted date and time representation.
> Indeed there is a space between the date and the time, as the specification
> says having a space separator means there two fields : a 'date field' and a
> 'time field'.
> The specification consider this as acceptable for human reading though.
> However when processing logs it might cause some trouble to effectively parse
> the fields, especially when correlating logs from different applications. For
> now we have workarounds, but it seems reasonable to have a correct ISO8601
> formatting.
> The correct ISO8601 representation for a 'date and time field' is to have the
> T indicator, for example '2007-03-01T13:00:00Z'.
> The workaround for now is to write ourself the correct ISO8601 pattern.
> Oh and by the way the timezone formatting options in the SimpleDateFormat are
> incomplete. The JodaTime format class org.joda.time.format.ISODateTimeFormat
> worth a look on this matter. Anyway date and time related classes in the JDK
> are not known for being the best at what they do.
> This problem is also found in log4j.
> An excerpt of the specification is documented on wikipedia.
> http://en.wikipedia.org/wiki/ISO_8601#Combined_date_and_time_representations
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