how to change filename in my rolling file appender in my Java program

I want to change my filename in my rollingfile appender and add current date to it here is my config :

    <RollingFile
  name="rollingFile"
  fileName="logs/%d{YYYY-MM-DD}.application.log"
     filePattern="logs/application.%d{dd-MMM}.log.gz"
  ignoreExceptions="false">
  <PatternLayout>
      <Pattern>%m</Pattern>
  </PatternLayout>
  <Policies>
      <TimeBasedTriggeringPolicy interval="1"/>
  </Policies>
  <DefaultRolloverStrategy max="5" />
</RollingFile>

but when I do this the file that is created for me in my logs folder is Like this :

%d{YYYY-MM-DD}.application.log

why? I just want to add my current date but log4j doesn't detect %d{YYYY-MM-DD} pattern and adds the exact string??!

Solution

As far as I understand fileName should be the exact name of the log file before it is "rolled" (the active log file). The filePattern determines what the file is renamed to when it is rolled. Try setting fileName to just logs/application.log and use the date format you want for archived files in filePattern.