The date of the file pattern is displayed as the date of the previous day.

<RollingFile name="DefaultAppender" fileName="${sys:LOG_PATH}/${sys:DEFAULT_LOG_NAME}" filePattern="./log/backup/default/app2-%d{yyyy-MM-dd HH:mm:ss}.log.gz"> 
<PatternLayout pattern="${sys:FILE_LOG_PATTERN}"/> 
<Policies> 
<CronTriggeringPolicy schedule="0 33 18 * * ? *" /> 
<SizeBasedTriggeringPolicy size="10 MB" /> 
</Policies> 
</RollingFile>