Extract the last day of a certain month from a certain year without using DaysInMonth

Question

I need to create a function that extracts the last day of a certain month from a certain year. I am not allowed to use the function DaysInMonth(). The month and year should be the arguments of the function which returns the day. I must also use only linear structure. Has anyone got any idea?

Type of project: Windows Forms App

To show the last day, I will use a button that executes the programm and 2 textboxs in which I will type the month and year (these 2 are associated with the arguments of the defined function).

Answer 1

If you already studied how to convert strings to numbers and how to perform basic operations with DateTime, then try this approach:

• Build a DateTime using provided month and year, specifying 1 for day. (See constructors of DateTime).
• Use AddMonths(1), which will move to the first day of the next month.
• Use AddDays(-1), which will give the last day of the month.

Do you need additional assistance?