Worked on the wikimedia/wikipedia-ios repository to enhance the reliability of the On This Day widget by addressing a critical bug in date calculations. Focused on stabilizing date-based features, the developer standardized the use of the Gregorian calendar throughout the data handling layer and cell configuration, ensuring accurate years-ago displays across different locales and time zones. This approach eliminated calendar-related edge cases and improved data and UI consistency. Leveraging Swift and iOS development skills, the work strengthened the foundation for future date-related features and contributed to more dependable widget behavior, with all changes traceable through detailed commit references for transparency.