Lich Le Tuan enhanced date input handling in the LifeSG/react-design-system repository over a two-month period, focusing on improving data accuracy and user experience. He addressed timezone-aware date parsing in the date picker and introduced a date normalization utility, ensuring consistent and reliable date processing across the application. Using React, TypeScript, and JavaScript, Lich strengthened input validation and implemented effective sanitization of user input, aligning the user interface with established design patterns. His work established maintainable patterns for date-related validation, reducing errors in bookings and UI displays while supporting future feature development through robust, well-structured front end code changes.