Day Month Year Set Day Set Month Set Year Leap Year? Days in Month Days Passed Days Remaining Calculate Add Days Create Copy Copy from Another Date Friday April 12 2025 UI Design: Date Input: Three text boxes labeled and . These could be pre-populated with the current date or allow user input. Manipulation Section: buttons (corresponding to methods (a) (b) (c) of class). A label displaying that updates dynamically based on (method (g)). Two sections for calculations: Days in Month: Text box entering a number days (can left blank month). Button (h)). display result (number days). Passed/Remaining: radio buttons: calculation). (methods (i) (j)). Modification: (k)). add. Management: (l)). (m)). (Optional: Additional input fields other date). Display: separate area calculations. This include full (e.g. ) specific components (day month year) depending your preference. Implementation Notes: The actual development would involve using provided by framework like Windows Forms WPF Java Swing Qt others programming language. elements connected corresponding class behind scenes. User interactions (text boxes buttons etc.) trigger calculations within class results reflected area. design provides basic structure interacting functionalities. You can customize it further needs such as: Adding error handling invalid Including options day week. Implementing additional features related manipulation. I hope this detailed explanation clearer picture possible class.