Worked on enhancing IAM date filtering for the SELISEdigitalplatforms/l3-react-blocks-construct repository, focusing on whole-day range support within the user interface. Implemented logic to treat single-day selections as full-day intervals and introduced a date range containment utility to improve filtering accuracy. Utilized React and TypeScript to address issues with start-date application and ensure same-day IAM records remained visible, resulting in clearer and faster data presentation. Expanded test coverage to validate the new filtering logic, which improved reliability and maintainability. The work enabled more accurate IAM data visibility, streamlined user feedback, and reduced the need for manual intervention in the UI.