using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        var cars = new Car[]

            {

                new Car { PlateNo = "LST338", StartDate = new DateTime(2021, 7, 4, 0, 0, 0) },

                new Car { PlateNo = "MFP945", StartDate = new DateTime(2022, 5, 6, 0, 0, 0) },

                new Car { PlateNo = "MYC247", StartDate = new DateTime(2022, 10, 6, 0, 0, 0) },

                new Car { PlateNo = "393GHR", StartDate = new DateTime(2022, 10, 6, 0, 0, 0) },

                new Car { PlateNo = "MYU116", StartDate = new DateTime(2023, 1, 6, 0, 0, 0) }

            };

​

            foreach (var car in cars)

            {

                while(car.StartDate < DateTime.Now.AddDays(30))

                {

                    car.StartDate = car.StartDate.AddDays(30);

                    Console.WriteLine($"{car.PlateNo} after 30 days: {car.StartDate}");

                }

            }

    }

    public class Car

    {

        public string PlateNo {get;set;}

        public DateTime StartDate {get;set;}

    }

}