using System;

public class Test
{
	public static void Main()
	{
		DateTime dt = DateTime.UtcNow;
        var FirstDayOfNextMonth = new DateTime(dt.Year, dt.Month, 1).AddMonths(1);
        var LastDayOfCurrentMonth = FirstDayOfNextMonth.AddDays(-1);
        Console.WriteLine(LastDayOfCurrentMonth); 
	}
}