Developed and integrated a max_age filter for the NewsDownloader component in the koreader/koreader repository, enabling feeds to exclude items older than a configurable threshold. This feature required implementing multi-format time parsing and ensuring seamless integration into the existing feed processing workflow. By focusing on Lua for plugin development and feed parsing, the work improved content freshness and optimized resource usage, reducing the presence of stale items for end users. Unit testing was employed to validate the new functionality and maintain reliability. The approach demonstrated attention to both user relevance and system efficiency, addressing a targeted need within the feed pipeline.