Worked on the weaviate/weaviate-python-client repository to enhance the reliability of time-based filtering in backend systems. Focused on hardening the FilterByTime logic, the work introduced input validation for empty lists in time filters, ensuring that malformed queries now raise explicit exceptions rather than failing silently. Leveraging Python, the developer aligned error handling with established patterns by raising WeaviateInvalidInputError, improving consistency across filter operations. Comprehensive unit tests were added for contains_any and contains_none methods on creation_time and update_time, increasing test coverage and robustness. This effort improved the maintainability and predictability of time-based queries within the client library.