Worked on enhancing date and time parsing reliability in the uutils/coreutils and uutils/parse_datetime repositories, focusing on aligning behavior with GNU date for consistent command-line outputs. Leveraged Rust for backend development, improving timezone handling, supporting am/pm time formats, and ensuring accurate negative timestamp processing. Refined parsing logic to unify code paths and maintain correct UTC semantics, while expanding regression and unit test coverage to prevent future discrepancies. These changes increased cross-platform consistency and scripting compatibility, reducing support overhead for users relying on precise date manipulation. The work emphasized maintainable code and robust testing practices to support ongoing localization improvements.