using System;

​

public class Program

{

    public static void Main(string[] args)

        {

            const int ThreeMonthTargetAttendance = 30;

            const int SixMonthTargetAttendance = 60;

            const int TwelveMonthTargetAttendance = 120;

​

            var patchStartDate = new DateTime(2019, 5, 1);

​

            var clientId = 32342;

​

            // First check to see if the patch program has begun.

            if (patchStartDate < DateTime.Now)

            {

                // Default values for everyone who begins the program with historical data.

                DateTime threeMonthStartDate = DateTime.Now.AddMonths(-3);

                DateTime sixMonthStartDate = DateTime.Now.AddMonths(-6);

                DateTime twelveMonthStartDate = DateTime.Now.AddMonths(-12);

​

                // Cover the "hard-start-date" scenario where a year has not elapsed.

                if (patchStartDate > DateTime.Now.AddYears(-1))

                {

                    threeMonthStartDate = sixMonthStartDate = twelveMonthStartDate = patchStartDate;

                }

​

                bool threeMonthEarned = GetClientAttendanceBetween(clientId, threeMonthStartDate, DateTime.Now) > ThreeMonthTargetAttendance;

                bool sixMonthEarned = GetClientAttendanceBetween(clientId, sixMonthStartDate, DateTime.Now) > SixMonthTargetAttendance;

                bool twelveMonthEarned = GetClientAttendanceBetween(clientId, twelveMonthStartDate, DateTime.Now) > TwelveMonthTargetAttendance;

​

                Console.WriteLine("3 month: " + threeMonthEarned + ", 6 month: " + sixMonthEarned + ", 12 month: " + twelveMonthEarned);

            }

​

            Console.WriteLine("Done...");

        }

​

        private static int GetClientAttendanceBetween(int clientId, DateTime startDate, DateTime endDate)

        {

            // Calculate client attendance here

            return 75;

        }

}