This is a standard Oracle Application Express (APEX) calendar region component showing a weekly view on events with a time component. This suits well to display conference or similar schedules. On this page, you can change the start and end timestamps for the individual sessions by dragging them around.

Calendar drag and drop can be enabled using the component attribute Drag and Drop. Your SQL query must select a primary key column and you must have set the Primary Key Column calendar attribute. Then enter the PL/SQL code to update the event row in the database in the Drag and Drop PL/SQL Code attribute. That PL/SQL code typically performs a SQL update on the database table - the bind variables :APEX$PK_VALUE., :APEX$NEW_START_DATE and :APEX$NEW_END_DATE contain the dragged events primary key value as well as the new start and new end timestamp.