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https://issues.apache.org/jira/browse/LOG4J2-1073?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14680176#comment-14680176
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Kenneth Taylor commented on LOG4J2-1073:
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We are also seeing this problem and it started happening a few micro versions 
back. It may be related to Java 8. The %d{} pattern is not working if you enter 
any date formatting characters. The special key values like COMPACT still work. 
On our systems %d{yyyy} yields 5301.

> RollingFileAppender working file and archives have wrong date values
> --------------------------------------------------------------------
>
>                 Key: LOG4J2-1073
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-1073
>             Project: Log4j 2
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 2.3
>            Reporter: Ben Hess
>
> Suppose I have RollingFile appenders within a Route.  Configuration below 
> explanation - pretty typical, should rollover every day.
> Suppose today's date is Jul 2 2015, and the program has been running since 
> Jun 30 2015.
> So for each Routed RollingFile I should have three files with entries having 
> the correct dates:
> program-general.log                      - has entries from 7/2/2015 only
> program-general.2015-07-01.log  - has entries from 7/1/2015 only
> program-general.2015-06-30.log  - has entries from 6/30/2015 only
> Except what I have is the following:
> program-general.log                      - has entries from 6/30 - 7/02
> program-general.2015-07-01.log  - has entries from 6/30 - 7/01
> program-general.2015-06-30.log  - has entries from 6/30
> The relevant configuration:
> <Appenders>
>       <RollingFile name="generalAppender" fileName="logs/program-general.log" 
> filePattern="logs/program-general.%d{yyyy-MM-dd}.log">          
>               <PatternLayout pattern="%d [%t] %-5p %c{1} - %m%n %ex"/>        
>               <TimeBasedTriggeringPolicy interval="1" modulate="true"/>
>               <DefaultRolloverStrategy max="7"/>      
>       </RollingFile>
>     <Routing name="RoutingAppender">
>         <Routes pattern="${ctx:propertyId}">
>             <Route>
>                 <RollingFile name="Rolling-${ctx:propertyId}"
>                              fileName="logs/program-${ctx:propertyId}.log"
>                              
> filePattern="logs/program-${ctx:propertyId}.%d{yyyy-MM-dd}.log">
>                    
>                     <PatternLayout pattern="%d [%t] %-5p %c{1} - %m%ex%n"/>
>                                       <TimeBasedTriggeringPolicy interval="1" 
> modulate="true"/>
>                       <DefaultRolloverStrategy max="7"/>
>                 </RollingFile>
>             </Route>
>             <Route ref="generalAppender" key="${ctx:propertyId}"/>
>          </Routes>
>     </Routing>
> </Appenders>



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