[2.5] CronTriggeringPolicy renaming behavior when midnight.

Hi.
I tried CrontriggeringPolicy(added 2.5) for save daily log files at midnight.
My goal is, for example.
if today is 2015/01/01, "http.log" <- active file.
and when midnight, "http.log" will be renamed "http_20150101.log", and create new "http.log".

But my problem is when midnight, "http.log" renamed "http_20150102.log"...
I want to make that file's name "http_20150101.log" because that file has 2015/01/01's log,

Here's my configure xml.

<Routing name="routing_file">
  <Routes pattern="pattern1">
    <Route key="http">
      <RollingFile name="rolling_http" filename="${path}/http.log" filepattern="${path}/http_%d{yyyyMMdd}.log">
        <PatternLayout pattern="http"/>
        <CronTriggeringPolicy schedule="0 0 0 * * ?"/>
      </RollingFile>
    </Route>
  </Routes>
</Routing>

Please help me.
Thanks for your help, I'm very appreciated it