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https://issues.apache.org/jira/browse/LOG4J2-670?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14075514#comment-14075514
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Scott Harrington commented on LOG4J2-670:
-----------------------------------------

You're going to get complaints from more folks about changing this 
long-standing format, which happens to be the default if nothing is specified 
after the '%d'.

What I mean is, a lot of people have been getting the space separator, and they 
are not explicitly asking for ISO8601, and now they're going to start getting a 
'T' separator.

Presence/absence of a space will affect anyone who slices up their log files 
using awk or cut with whitespace delimiters.

I suggest you introduce a new pattern named 'DEFAULT' (and which gets used by 
default):

{noformat}
%d{ISO8601} = yyyy-MM-dd'T'HH:mm:ss,SSS
%d{ISO8601_BASIC} = yyyyMMdd'T'HHmmss,SSS
%d = %d{DEFAULT} = yyyy-MM-dd HH:mm:ss,SSS
{noformat}


> DatePatternConverter ISO8601_PATTERN does not conform to ISO8601
> ----------------------------------------------------------------
>
>                 Key: LOG4J2-670
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-670
>             Project: Log4j 2
>          Issue Type: Bug
>          Components: Pattern Converters
>    Affects Versions: 2.0-rc1
>            Reporter: Ralph Goers
>            Assignee: Remko Popma
>             Fix For: 2.0.1
>
>
> ISO8601_PATTERN is defined with a space between the date and the time. 
> ISO8601 requires a 'T' between the date and the time.



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