In December 2024, Ace Pace enhanced the test suite for the plotly/plotly.py repository by addressing issues related to deprecated datetime handling. Using Python and testing best practices, Ace migrated test code from naive datetime usage to timezone-aware patterns, replacing utcnow with timezone-aware datetime.now. This technical approach improved the reliability and determinism of tests across different environments, reducing flaky results caused by inconsistent date and time logic. The work focused on aligning with internal standards for maintainability and correctness, demonstrating a solid understanding of Python’s datetime module and robust testing methodologies within a widely used open-source codebase.