Anq Calc, C# - rextester

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            //Your code goes here
            Console.WriteLine("Hello, world!");
            
            var calOnDate = Convert.ToDateTime("2018/01/28");
            var dob1 = Convert.ToDateTime("1966/07/19");
            var dob2 = Convert.ToDateTime("1967/08/23");
            
            Console.WriteLine(calculateANQ(dob1,calOnDate).ToString("dd-MM-yyyy"));
            
            Console.WriteLine(calculateANQ(dob1,dob2,calOnDate).ToString("dd-MM-yyyy"));

}
        
        public static int findMonthQuarter(DateTime date)
        {
            if (date.Month >= 1 && date.Month <= 3)
                return 1;
            else if (date.Month >= 4 && date.Month <= 6)
                return 2;
            else if (date.Month >= 7 && date.Month <= 9)
                return 3;
            else
                return 4;

}
        public static DateTime calculateANQ(DateTime dob,DateTime calcOnDate)
        {
            var fromData =  calcOnDate;
            var yearDiff = DateTime.UtcNow.Year - dob.Year;
            DateTime q1Ann = fromData, q2Ann = fromData, q3Ann = DateTime.UtcNow, q4Ann = fromData, nextyearAnn = fromData, ANQ = fromData, currentDate = fromData;
            var bday = dob.AddYears(yearDiff);
            var nextMonth = fromData.AddDays(30);

switch (findMonthQuarter(dob))
            {
                case 1:
                    q1Ann = bday;
                    q2Ann = q1Ann.AddMonths(3);
                    q3Ann = q1Ann.AddMonths(6);
                    q4Ann = q1Ann.AddMonths(9);
                    nextyearAnn = q1Ann.AddMonths(12);
                    break;
                case 2:
                    q2Ann = bday;
                    q1Ann = q2Ann.AddMonths(-3);
                    q3Ann = q2Ann.AddMonths(3);
                    q4Ann = q2Ann.AddMonths(6);
                    nextyearAnn = q2Ann.AddMonths(9);
                    break;
                case 3:
                    q3Ann = bday;
                    q2Ann = q3Ann.AddMonths(-3);
                    q1Ann = q3Ann.AddMonths(-6);
                    q4Ann = q3Ann.AddMonths(3);
                    nextyearAnn = q3Ann.AddMonths(6);
                    break;
                case 4:
                    q4Ann = bday;
                    q3Ann = q4Ann.AddMonths(-3);
                    q2Ann = q4Ann.AddMonths(-6);
                    q1Ann = q4Ann.AddMonths(-9);
                    nextyearAnn = q4Ann.AddMonths(3);
                    break;
            }

switch (findMonthQuarter(currentDate))
            {
                case 1:
                    if (q1Ann.Date < nextMonth.Date && q1Ann.Date > currentDate.Date)
                        ANQ = q1Ann;
                    else if (q2Ann.Date < nextMonth.Date && q2Ann.Date > currentDate.Date)
                        ANQ = q2Ann;
                    else
                        ANQ = nextMonth;
                    break;
                case 2:
                    if (q2Ann.Date < nextMonth.Date && q2Ann.Date > currentDate.Date)
                        ANQ = q2Ann;
                    else if (q3Ann.Date < nextMonth && q3Ann.Date > currentDate.Date)
                        ANQ = q3Ann;
                    else
                        ANQ = nextMonth;
                    break;
                case 3:
                    if (q3Ann.Date < nextMonth.Date && q3Ann.Date > currentDate.Date)
                        ANQ = q3Ann;
                    else if (q4Ann.Date < nextMonth.Date && q4Ann.Date > currentDate.Date)
                        ANQ = q4Ann;
                    else
                        ANQ = nextMonth;
                    break;
                case 4:
                    if (q4Ann.Date < nextMonth.Date && q4Ann.Date > currentDate.Date)
                        ANQ = q4Ann;
                    else if (nextyearAnn.Date < nextMonth.Date && nextyearAnn.Date > currentDate.Date)
                        ANQ = nextyearAnn;
                    else
                        ANQ = nextMonth;
                    break;
            }
            if (ANQ != nextMonth)
                ANQ = ANQ.AddDays(-1);
            return ANQ;

}
        
        public static DateTime calculateANQ(DateTime dob1, DateTime dob2, DateTime calcOnDate)
        {
            var fromData =  calcOnDate;
            var yearDiff1 = DateTime.UtcNow.Year - dob1.Year;
            var yearDiff2 = DateTime.UtcNow.Year - dob2.Year;
            DateTime q1Ann = fromData, q2Ann = fromData, q3Ann = fromData, q4Ann = fromData, nextyearAnn = fromData, ANQ = fromData, currentDate = fromData;
            DateTime q1Ann2 = fromData, q2Ann2 = fromData, q3Ann2 = fromData, q4Ann2 = fromData, nextyearAnn2 = fromData;
            var bday1 = dob1.AddYears(yearDiff1);
            var bday2 = dob2.AddYears(yearDiff2);
            var datelist = new List<DateTime>();
            var nextMonth = DateTime.UtcNow.AddDays(30);

switch (findMonthQuarter(dob1))
            {
                case 1:
                    q1Ann = bday1;
                    q2Ann = q1Ann.AddMonths(3);
                    q3Ann = q1Ann.AddMonths(6);
                    q4Ann = q1Ann.AddMonths(9);
                    nextyearAnn = q1Ann.AddMonths(12);
                    break;
                case 2:
                    q2Ann = bday1;
                    q1Ann = q2Ann.AddMonths(-3);
                    q3Ann = q2Ann.AddMonths(3);
                    q4Ann = q2Ann.AddMonths(6);
                    nextyearAnn = q2Ann.AddMonths(9);
                    break;
                case 3:
                    q3Ann = bday1;
                    q2Ann = q3Ann.AddMonths(-3);
                    q1Ann = q3Ann.AddMonths(-6);
                    q4Ann = q3Ann.AddMonths(3);
                    nextyearAnn = q3Ann.AddMonths(6);
                    break;
                case 4:
                    q4Ann = bday1;
                    q3Ann = q4Ann.AddMonths(-3);
                    q2Ann = q4Ann.AddMonths(-6);
                    q1Ann = q4Ann.AddMonths(-9);
                    nextyearAnn = q4Ann.AddMonths(3);
                    break;
            }
            switch (findMonthQuarter(dob2))
            {
                case 1:
                    q1Ann2 = bday2;
                    q2Ann2 = q1Ann2.AddMonths(3);
                    q3Ann2 = q1Ann2.AddMonths(6);
                    q4Ann2 = q1Ann2.AddMonths(9);
                    nextyearAnn2 = q1Ann2.AddMonths(12);
                    break;
                case 2:
                    q2Ann2 = bday2;
                    q1Ann2 = q2Ann2.AddMonths(-3);
                    q3Ann2 = q2Ann2.AddMonths(3);
                    q4Ann2 = q2Ann2.AddMonths(6);
                    nextyearAnn2 = q2Ann2.AddMonths(9);
                    break;
                case 3:
                    q3Ann2 = bday2;
                    q2Ann2 = q3Ann2.AddMonths(-3);
                    q1Ann2 = q3Ann2.AddMonths(-6);
                    q4Ann2 = q3Ann2.AddMonths(3);
                    nextyearAnn2 = q3Ann2.AddMonths(6);
                    break;
                case 4:
                    q4Ann2 = bday2;
                    q3Ann2 = q4Ann2.AddMonths(-3);
                    q2Ann2 = q4Ann2.AddMonths(-6);
                    q1Ann2 = q4Ann2.AddMonths(-9);
                    nextyearAnn2 = q4Ann2.AddMonths(3);
                    break;
            }

switch (findMonthQuarter(currentDate))
            {
                case 1:
                    if (q1Ann.Date > currentDate.Date)
                        datelist.Add(q1Ann);
                    if (q2Ann.Date > currentDate.Date)
                        datelist.Add(q2Ann);
                    datelist.Add(nextMonth);
                    if (q1Ann2.Date > currentDate.Date)
                        datelist.Add(q1Ann2);
                    if (q2Ann2.Date > currentDate.Date)
                        datelist.Add(q2Ann2);

break;
                case 2:
                    if (q2Ann.Date > currentDate.Date)
                        datelist.Add(q2Ann);
                    if (q3Ann.Date > currentDate.Date)
                        datelist.Add(q3Ann);
                    datelist.Add(nextMonth);
                    if (q2Ann2.Date > currentDate.Date)
                        datelist.Add(q2Ann2);
                    if (q3Ann2.Date > currentDate.Date)
                        datelist.Add(q3Ann2);
                    break;
                case 3:
                    if (q3Ann.Date > currentDate.Date)
                        datelist.Add(q3Ann);
                    if (q4Ann.Date > currentDate.Date)
                        datelist.Add(q4Ann);
                    datelist.Add(nextMonth);
                    if (q3Ann2.Date > currentDate.Date)
                        datelist.Add(q3Ann2);
                    if (q4Ann2.Date > currentDate.Date)
                        datelist.Add(q4Ann2);
                    break;
                case 4:
                    if (q4Ann.Date > currentDate.Date)
                        datelist.Add(q4Ann);
                    if (nextyearAnn.Date > currentDate.Date)
                        datelist.Add(nextyearAnn);
                    datelist.Add(nextMonth);
                    if (q4Ann2.Date > currentDate.Date)
                        datelist.Add(q4Ann2);
                    if (nextyearAnn2.Date > currentDate.Date)
                        datelist.Add(nextyearAnn2);
                    break;
            }
            var ANQ1 = datelist.OrderBy(x => x).FirstOrDefault();
            if (ANQ1 != nextMonth)
                ANQ1 = ANQ1.AddDays(-1);
            return ANQ1;

}
    }
}

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Compilation time: 0,17 sec, absolute running time: 0,11 sec, cpu time: 0,09 sec, average memory usage: 18 Mb, average nr of threads: 3