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https://issues.apache.org/jira/browse/LOG4J2-2804?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17200869#comment-17200869
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Ian Underhill commented on LOG4J2-2804:
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sorry I posted my testing config and not the correct one to highlight the day 
shift in the very first file rollover. you would have to have an interval of 
1day in seconds ie. 86400

> RollingRandomAccessFile uses wrong time for filename
> ----------------------------------------------------
>
>                 Key: LOG4J2-2804
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-2804
>             Project: Log4j 2
>          Issue Type: Bug
>          Components: Appenders
>    Affects Versions: 2.13.1
>            Reporter: André Pinto
>            Priority: Major
>
> When there are both size based and time based triggering policies, if the 
> size based policy is triggered, the file is named as if the time based policy 
> was triggered.
> Example config:
> {code:java}
> <?xml version="1.0" encoding="UTF-8"?>
> <Configuration status="WARN" name="Mux">
>     <Properties>
>         <Property name="LOG_DIR">logs</Property>
>     </Properties>
>     <Appenders>
>         <Console name="Console" target="SYSTEM_OUT"/>
>         <RollingRandomAccessFile name="main" 
> fileName="${LOG_DIR}/main-current.log-active"
>                                  
> filePattern="${LOG_DIR}/main-%d{yyyy-MM-dd-HH.mm.ss}.log"
>                                  ignoreExceptions="false" 
> immediateFlush="false"
>                                  bufferSize="1048576">
>             <PatternLayout>
>                 <Pattern>%m\n</Pattern>
>             </PatternLayout>
>             <Policies>
>                 <SizeBasedTriggeringPolicy size="256 B" />
>                 <TimeBasedTriggeringPolicy interval="3600" />
>             </Policies>
>             <DefaultRolloverStrategy fileIndex="nomax" />
>         </RollingRandomAccessFile>
>     </Appenders>
>     <Loggers>
>         <Root level="OFF">
>             <AppenderRef ref="Console" />
>         </Root>
>         <Logger name="main" level="ALL" additivity="false">
>             <AppenderRef ref="main"/>
>         </Logger>
>     </Loggers>
> </Configuration>
> {code}
> With this configuration if I start writing log entries to the "main" logger 
> at 2020-03-09 13:00.00 and immediately trigger the SizeBasedTriggeringPolicy 
> (256 bytes), the name of the file that is rolled over will be:
> main-2020-03-09-14.00.00
> as if the rollover operation had been triggered by the time policy.



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