See https://rt.cpan.org/Public/Dist/Display.html?Name=Log-Dispatch-FileRotate the module needs love, there are a few patches and other tips listed, try them out

In reply to Re: Log::Log4perl and Log::Dispatch::FileRotate: Issues rotating log files based on date pattern by Anonymous Monk
in thread [SOLVED] Log::Log4perl and Log::Dispatch::FileRotate: Issues rotating log files based on date pattern by ateague

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