Worked on the mathworks/arrow repository to enhance Gandiva’s time casting functionality by addressing an error in castTIMESTAMP_utf8 and castTIME_utf8. The solution involved truncating subseconds beyond three digits, aligning the behavior with other implementations and improving runtime stability across platforms. This C++ development effort focused on robust error handling and comprehensive unit testing, updating tests to verify truncation and adding edge cases for regression coverage. The change reduced user-visible failures in time casting and supported more reliable downstream data pipelines. The work demonstrated attention to maintainability and cross-platform consistency, emphasizing test-driven development and precompiled time function techniques.